Copy and complete the table to show the units and their symbols for each of the quantities shown. Unit Symbol for unit Potential difference Current Resistance

The table shows the unit of the parameters in the ohm's law. Ohm's law states that the potential difference and current across the resistance are proportional and the ratio of voltage to current gives the value of resistance. Unit Symbol for unit Potential difference volt V Current ampere A Resistance ohm Ω

EASY

Upper Secondary: IGCSE

IMPORTANT

Earn 100

A car battery has an emf of $12 V$ . How much energy does it transfer to $1 C$ of charge flowing around the circuit?

Important Questions on Electrical Quantities

EASY

Upper Secondary: IGCSE

IMPORTANT

Cambridge IGCSE® Physics Coursebook Second Edition>Chapter 18 - Electrical Quantities>Questions>Q 18.22

Write down the equation connecting $watt, volt, ampere$ .

EASY

Upper Secondary: IGCSE

IMPORTANT

Cambridge IGCSE® Physics Coursebook Second Edition>Chapter 18 - Electrical Quantities>Questions>Q 18.23

10 V

power supply pushes a current of

5.0 A

through a resistor. At what rate the energy is transferred to the resistor?

EASY

Upper Secondary: IGCSE

IMPORTANT

Cambridge IGCSE® Physics Coursebook Second Edition>Chapter 18 - Electrical Quantities>Questions>Q 18.24

A tropical fish tank is fitted with an electric heater, which has a power rating of

30 W

. The heater is connected to a

12 V

supply. What current flows through the heater when it is switched on?

EASY

Upper Secondary: IGCSE

IMPORTANT

Cambridge IGCSE® Physics Coursebook Second Edition>Chapter 18 - Electrical Quantities>Questions>Q 18.25

How much energy is transformed by an electric lamp in

100 s

if a current of

0.22 A

flows through it when it is connected to a

120 V

supply?

HARD

Upper Secondary: IGCSE

IMPORTANT

Cambridge IGCSE® Physics Coursebook Second Edition>Chapter 18 - Electrical Quantities>End-of-chapter questions>Q 3

Draw a circuit diagram to show how a voltmeter and an ammeter are used to measure the resistance of a lamp.

MEDIUM

Upper Secondary: IGCSE

IMPORTANT

Cambridge IGCSE® Physics Coursebook Second Edition>Chapter 18 - Electrical Quantities>End-of-chapter questions>Q 3

Write the equation relating voltage, current and resistance that you would use to calculate the resistance of the lamp.

MEDIUM

Upper Secondary: IGCSE

IMPORTANT

Cambridge IGCSE® Physics Coursebook Second Edition>Chapter 18 - Electrical Quantities>End-of-chapter questions>Q 4

Copy and complete the table to show the units and their symbols for each of the quantities shown.

	Unit	Symbol for unit
Potential difference
Current
Resistance

HARD

Upper Secondary: IGCSE

IMPORTANT

Cambridge IGCSE® Physics Coursebook Second Edition>Chapter 18 - Electrical Quantities>End-of-chapter questions>Q 6

Copy and complete the table below (leave plenty of space!). The first column shows a symbol equation relating quantities. In the second column, write the same equation in words to show the names of the quantities. In the third column, write the same equation in units.

Equation	In words	In units
$Q = I t$
$R = \frac{V}{I}$
$P = I V$
$E = I V t$

A car battery has an emf of 12 V. How much energy does it transfer to 1 C of charge flowing around the circuit?

Important Questions on Electrical Quantities

Learn and Prepare for any exam you want !

A car battery has an emf of $12 V$ . How much energy does it transfer to $1 C$ of charge flowing around the circuit?