Draw an energy flow diagram for the following power transmission system: Solar panel ( 20 % efficient) Solar inverter (converts DC to AC, 95 % efficient) Step-up transformer ( 95 % efficient) Overhead power transmission cable ( 95 % efficient) Step-down transformer 95 % efficient). Assume that there is 1000 J of solar energy arriving at the solar panel.

Solar energy arriving at solar panel is 1000 J . The efficiency of solar panel is 20 % of solar energy. Useful energy from the solar panel is = 1000 × 20 100 = 200 J The efficiency of solar inverter is 95 % of solar panel. Useful energy from the inverter is = 200 × 95 100 = 190 J The efficiency of step-up transformer is 95 % of solar inverter. Useful energy from the step-up transformer is 190 × 95 100 = 180 . 5 J The efficiency of overhead power transmission cable is 95 % of the step-up transformer. Useful energy from the power transmission cable is = 180 . 5 × 95 100 = 172 . 475 J The efficiency of step-down transformer is 95 % of power transmission cable. Useful energy from the step-down transformer is = 171 . 475 × 95 100 = 162 . 9 J The energy flow diagram is shown in the following diagram. All the wasted energy is in the form of thermal energy.

Draw an energy flow diagram for the following power transmission system: Solar panel ( 20 % efficient) Solar inverter (converts DC to AC, 95 % efficient) Step-up transformer ( 95 % efficient) Overhead power transmission cable ( 95 % efficient) Step-down transformer 95 % efficient). Assume that there is 1000 J of solar energy arriving at the solar panel. What is the overall efficiency of the power transmission system?

Solar energy arriving at the solar panel is 1000 J . The efficiency of the solar panel is 20 % of solar energy. Useful energy from the solar panel is = 1000 × 20 100 = 200 J The efficiency of solar inverter is 95 % of solar panel. Useful energy from the inverter is = 200 × 95 100 = 190 J The efficiency of step-up transformer is 95 % of solar inverter. Useful energy from the step-up transformer is 190 × 95 100 = 180 . 5 J The efficiency of the overhead power transmission cable is 95 % of the step-up transformer. Useful energy from the power transmission cable is = 180 . 5 × 95 100 = 172 . 475 J The efficiency of a step-down transformer is 95 % of the power transmission cable. Useful energy from the step-down transformer is = 171 . 475 × 95 100 = 162 . 9 J The energy flow diagram is shown in the following diagram. The overall efficiency of the power transmission is = total energy output total energy input = 162 . 9 1000 × 100 = 16 . 29 % All the wasted energy is in the form of thermal energy.

David Sang and Darrell Hamilton Solutions for Chapter: Energy Stores and Transfers, Exercise 2: Exercise 6.2

Author:David Sang & Darrell Hamilton

David Sang Physics Solutions for Exercise - David Sang and Darrell Hamilton Solutions for Chapter: Energy Stores and Transfers, Exercise 2: Exercise 6.2

Attempt the free practice questions on Chapter 6: Energy Stores and Transfers, Exercise 2: Exercise 6.2 with hints and solutions to strengthen your understanding. Physics for Cambridge IGCSE workbook solutions are prepared by Experienced Embibe Experts.

Questions from David Sang and Darrell Hamilton Solutions for Chapter: Energy Stores and Transfers, Exercise 2: Exercise 6.2 with Hints & Solutions

EASY

Upper Secondary-IGCSE

IMPORTANT

Physics for Cambridge IGCSE workbook>Chapter 6 - Energy Stores and Transfers>Exercise 6.2>Q 1

A washing machine has a motor that turns the drum. In a particular washing machine, the motor is supplied with $1200 J$ of energy each second. Of this, $900 J$ of energy is used to turn the drum. The rest is wasted as thermal energy. Calculate the amount of energy wasted each second.

EASY

Upper Secondary-IGCSE

IMPORTANT

Physics for Cambridge IGCSE workbook>Chapter 6 - Energy Stores and Transfers>Exercise 6.2>Q 2

EASY

Upper Secondary-IGCSE

IMPORTANT

Physics for Cambridge IGCSE workbook>Chapter 6 - Energy Stores and Transfers>Exercise 6.2>Q 2

EASY

Upper Secondary-IGCSE

IMPORTANT

Physics for Cambridge IGCSE workbook>Chapter 6 - Energy Stores and Transfers>Exercise 6.2>Q 4

Figure shows the energy transfers in a light bulb each second. A coal-fired power station is used to provide the electricity. Calculate the efficiency of the bulb.

Question Image

EASY

Upper Secondary-IGCSE

IMPORTANT

Physics for Cambridge IGCSE workbook>Chapter 6 - Energy Stores and Transfers>Exercise 6.2>Q 5

Draw an energy flow diagram for the following power transmission system:

Solar panel ( $20 %$ efficient)
Solar inverter (converts DC to AC, $95 %$ efficient)
Step-up transformer ( $95 %$ efficient)
Overhead power transmission cable ( $95 %$ efficient)
Step-down transformer $95 %$ efficient).

Assume that there is $1000 J$ of solar energy arriving at the solar panel.

EASY

Upper Secondary-IGCSE

IMPORTANT

Physics for Cambridge IGCSE workbook>Chapter 6 - Energy Stores and Transfers>Exercise 6.2>Q 5

Draw an energy flow diagram for the following power transmission system:

Solar panel ( $20 %$ efficient)
Solar inverter (converts DC to AC, $95 %$ efficient)
Step-up transformer ( $95 %$ efficient)
Overhead power transmission cable ( $95 %$ efficient)
Step-down transformer $95 %$ efficient).

Assume that there is $1000 J$ of solar energy arriving at the solar panel.

What is the overall efficiency of the power transmission system?

David Sang and Darrell Hamilton Solutions for Chapter: Energy Stores and Transfers, Exercise 2: Exercise 6.2

David Sang Physics Solutions for Exercise - David Sang and Darrell Hamilton Solutions for Chapter: Energy Stores and Transfers, Exercise 2: Exercise 6.2

Questions from David Sang and Darrell Hamilton Solutions for Chapter: Energy Stores and Transfers, Exercise 2: Exercise 6.2 with Hints & Solutions

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