Low-energy light bulbs are designed to save energy, but do they also save money ? An individual low-energy bulb is more expensive than the filament bulb it replace. However, it lasts for much longer, typically 10000 hours. Some typical costs in pence p are shown in the table. Low-energy bulb Filament bulb Cost of one bulb 400 c 50 c number of bulbs required for 10000 hours 1 10 cost of electricity for 1 hours 0 . 2 c 1 . 0 c total cost of electricity for 10000 hours … … … … total cost of bulbs and electricity … … … … Copy the table and complete the second column to calculate the total cost of using a low-energy bulb for 10000 hours.

Given, An individual low-energy bulb is more expensive than the filament bulb it replaces. However, it lasts for much longer, typically 10000 hours. Some typical costs in pence p are shown in the table. Calculate the total cost of using a low-energy bulb for 10000 hours. Low-energy bulb Filament bulb Cost of one bulb 400 c 50 c number of bulbs required for 10000 hours 1 10 cost of electricity for 1 hours 0 . 2 c 1 . 0 c total cost of electricity for 10000 hours 200 1000 total cost of bulbs and electricity 600 1500

Low-energy light bulbs are designed to save energy, but do they also save money ? An individual low -energy bulb is more expensive than the filament bulb it replace. However, it lasts for much longer, typically 10000 hours. Some typical costs in pence p are shown in the table. Low-energy bulb Filament bulb Cost of one bulb 400 c 50 c number of bulbs required for 10000 hours 1 10 cost of electricity for 1 hours 0 . 2 c 1 . 0 c total cost of electricity for 10000 hours … … … … total cost of bulbs and electricity … … … … Complete the third column to calculate the cost of using filament bulbs instead of a single low-energy bulb.

Given, An individual low-energy bulb is more expensive than the filament bulb it replaces. However, it lasts for much longer, typically 10000 hours. Some typical costs in pence p are shown in the table. Calculate the total cost of using a low-energy bulb for 10000 hours. Low-energy bulb Filament bulb Cost of one bulb 400 c 50 c number of bulbs required for 10000 hours 1 10 cost of electricity for 1 hours 0 . 2 c 1 . 0 c total cost of electricity for 10000 hours 200 1000 total cost of bulbs and electricity 600 1500

Low-energy light bulbs are designed to save energy, but do they also save money ? An individual low -energy bulb is more expensive than the filament bulb it replace. However, it lasts for much longer, typically 10000 hours. Some typical costs in pence p are shown in the table. Low-energy bulb Filament bulb Cost of one bulb 400 c 50 c number of bulbs required for 10000 hours 1 10 cost of electricity for 1 hours 0 . 2 c 1 . 0 c total cost of electricity for 10000 hours … … … … total cost of bulbs and electricity … … … … How much money is saved by using a low-energy bulb ?

Given, An individual low -energy bulb is more expensive than the filament bulb it replace. However, it lasts for much longer, typically 10000 hours. Some typical costs in pence p are shown in the table. Calculate the total cost of using a low-energy bulb for 10000 hours. Low-energy bulb Filament bulb Cost of one bulb 400 c 50 c number of bulbs required for 10000 hours 1 10 cost of electricity for 1 hours 0 . 2 c 1 . 0 c total cost of electricity for 10000 hours 200 1000 total cost of bulbs and electricity 600 1500 Energy saved from Low energy bulb = Filament bulb - Low-energy bulb = 1500 - 600 Energy saved from Low energy bulb = 900 .

Low-energy light bulbs are designed to save energy, but do they also save money ? An individual low -energy bulb is more expensive than the filament bulb it replace. However, it lasts for much longer, typically 10000 hours. Some typical costs in pence p are shown in the table. Low-energy bulb Filament bulb Cost of one bulb 400 c 50 c number of bulbs required for 10000 hours 1 10 cost of electricity for 1 hours 0 . 2 c 1 . 0 c total cost of electricity for 10000 hours … … … … total cost of bulbs and electricity … … … … Suggest two reasons that people might have not using low-energy bulbs.

Given, An individual low -energy bulb is more expensive than the filament bulb it replace. However, it lasts for much longer, typically 10000 hours. Some typical costs in pence p are shown in the table. Calculate the total cost of using a low-energy bulb for 10000 hours. Low-energy bulb Filament bulb Cost of one bulb 400 c 50 c number of bulbs required for 10000 hours 1 10 cost of electricity for 1 hours 0 . 2 c 1 . 0 c total cost of electricity for 10000 hours 200 1000 total cost of bulbs and electricity 600 1500 Two reasons that people might have not using low-energy bulbs The cost of energy bulb is 8 times the filament bulb. Another reason for people's reluctance to use low energy bulbs is because of their experiences with early models. These took longer to light up to their full brightness, cast mainly a white light which not everyone preferred, and were bulky. All these issues have been addressed.

A power station burns rubbish to generate electricity. It also supplies hot water to nearby office and shops. In this an efficient use of energy ? Explain your answer using information from the diagram.

Given, A power station burns rubbish to generate electricity. It also supplies hot water to nearby office and shops. Yes this is the efficient use of energy as 35 % of the energy is generated in the form of electricity and 55 % of the energy is received in the form of hot water. Efficient energy use, sometimes simply called energy efficiency, is the goal to reduce the amount of energy required to provide products and services. For example, insulating a home allows a building to use less heating and cooling energy to achieve and maintain a comfortable temperature.

David Sang Solutions for Chapter: Energy Transformations and Energy Transfer, Exercise 7: End-of-chapter questions

Author:David Sang

David Sang Physics Solutions for Exercise - David Sang Solutions for Chapter: Energy Transformations and Energy Transfer, Exercise 7: End-of-chapter questions

Attempt the free practice questions on Chapter 6: Energy Transformations and Energy Transfer, Exercise 7: End-of-chapter questions with hints and solutions to strengthen your understanding. Cambridge IGCSE® Physics Coursebook Second Edition solutions are prepared by Experienced Embibe Experts.

Questions from David Sang Solutions for Chapter: Energy Transformations and Energy Transfer, Exercise 7: End-of-chapter questions with Hints & Solutions

MEDIUM

Upper Secondary: IGCSE

IMPORTANT

Cambridge IGCSE® Physics Coursebook Second Edition>Chapter 6 - Energy Transformations and Energy Transfer>End-of-chapter questions>Q 7

The girl on a skate ramp roller-skates down one side of the slope and up opposite side. She cannot quite reach the top of the slope, level with her starting position.

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Suggest how the girl could reach the top of the slope.

MEDIUM

Upper Secondary: IGCSE

IMPORTANT

Cambridge IGCSE® Physics Coursebook Second Edition>Chapter 6 - Energy Transformations and Energy Transfer>End-of-chapter questions>Q 8

Low-energy light bulbs are designed to save energy, but do they also save money $?$ An individual low-energy bulb is more expensive than the filament bulb it replace. However, it lasts for much longer, typically $10000$ hours. Some typical costs in pence $(p)$ are shown in the table.

	Low-energy bulb	Filament bulb
Cost of one bulb	$400 c$	$50 c$
number of bulbs required for $10000$ hours	$1$	$10$
cost of electricity for $1$ hours	$0.2 c$	$1.0 c$
total cost of electricity for $10000$ hours	$\dots \dots$	$\dots \dots$
total cost of bulbs and electricity	$\dots \dots$	$\dots \dots$

Copy the table and complete the second column to calculate the total cost of using a low-energy bulb for $10000$ hours.

MEDIUM

Upper Secondary: IGCSE

IMPORTANT

Cambridge IGCSE® Physics Coursebook Second Edition>Chapter 6 - Energy Transformations and Energy Transfer>End-of-chapter questions>Q 8

Low-energy light bulbs are designed to save energy, but do they also save money $?$ An individual low -energy bulb is more expensive than the filament bulb it replace. However, it lasts for much longer, typically $10000$ hours. Some typical costs in pence $(p)$ are shown in the table.

	Low-energy bulb	Filament bulb
Cost of one bulb	$400 c$	$50 c$
number of bulbs required for $10000$ hours	$1$	$10$
cost of electricity for $1$ hours	$0.2 c$	$1.0 c$
total cost of electricity for $10000$ hours	$\dots \dots$	$\dots \dots$
total cost of bulbs and electricity	$\dots \dots$	$\dots \dots$

Complete the third column to calculate the cost of using filament bulbs instead of a single low-energy bulb.

MEDIUM

Upper Secondary: IGCSE

IMPORTANT

Cambridge IGCSE® Physics Coursebook Second Edition>Chapter 6 - Energy Transformations and Energy Transfer>End-of-chapter questions>Q 8

Low-energy light bulbs are designed to save energy, but do they also save money $?$ An individual low -energy bulb is more expensive than the filament bulb it replace. However, it lasts for much longer, typically $10000$ hours. Some typical costs in pence $(p)$ are shown in the table.

	Low-energy bulb	Filament bulb
Cost of one bulb	$400 c$	$50 c$
number of bulbs required for $10000$ hours	$1$	$10$
cost of electricity for $1$ hours	$0.2 c$	$1.0 c$
total cost of electricity for $10000$ hours	$\dots \dots$	$\dots \dots$
total cost of bulbs and electricity	$\dots \dots$	$\dots \dots$

How much money is saved by using a low-energy bulb $?$

MEDIUM

Upper Secondary: IGCSE

IMPORTANT

Cambridge IGCSE® Physics Coursebook Second Edition>Chapter 6 - Energy Transformations and Energy Transfer>End-of-chapter questions>Q 8

Low-energy light bulbs are designed to save energy, but do they also save money $?$ An individual low -energy bulb is more expensive than the filament bulb it replace. However, it lasts for much longer, typically $10000$ hours. Some typical costs in pence $(p)$ are shown in the table.

	Low-energy bulb	Filament bulb
Cost of one bulb	$400 c$	$50 c$
number of bulbs required for $10000$ hours	$1$	$10$
cost of electricity for $1$ hours	$0.2 c$	$1.0 c$
total cost of electricity for $10000$ hours	$\dots \dots$	$\dots \dots$
total cost of bulbs and electricity	$\dots \dots$	$\dots \dots$

Suggest two reasons that people might have not using low-energy bulbs.

MEDIUM

Upper Secondary: IGCSE

IMPORTANT

Cambridge IGCSE® Physics Coursebook Second Edition>Chapter 6 - Energy Transformations and Energy Transfer>End-of-chapter questions>Q 9

A power station burns rubbish to generate electricity. It also supplies hot water to nearby office and shops.

Question Image

What two useful energy forms are produced $?$

MEDIUM

Upper Secondary: IGCSE

IMPORTANT

Cambridge IGCSE® Physics Coursebook Second Edition>Chapter 6 - Energy Transformations and Energy Transfer>End-of-chapter questions>Q 9

A power station burns rubbish to generate electricity. It also supplies hot water to nearby office and shops.

Question Image

What waste energy is produced $?$

MEDIUM

Upper Secondary: IGCSE

IMPORTANT

Cambridge IGCSE® Physics Coursebook Second Edition>Chapter 6 - Energy Transformations and Energy Transfer>End-of-chapter questions>Q 9

A power station burns rubbish to generate electricity. It also supplies hot water to nearby office and shops.

Question Image

In this an efficient use of energy $?$ Explain your answer using information from the diagram.

David Sang Solutions for Chapter: Energy Transformations and Energy Transfer, Exercise 7: End-of-chapter questions

David Sang Physics Solutions for Exercise - David Sang Solutions for Chapter: Energy Transformations and Energy Transfer, Exercise 7: End-of-chapter questions

Questions from David Sang Solutions for Chapter: Energy Transformations and Energy Transfer, Exercise 7: End-of-chapter questions with Hints & Solutions

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