Cambridge IGCSE® Physics Coursebook Second Edition>Chapter 18 - Electrical Quantities>Questions>Q 18.11

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Upper Secondary: IGCSE

IMPORTANT

Earn 100

What unit is emf measured in?

Important Questions on Electrical Quantities

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Upper Secondary: IGCSE

IMPORTANT

Cambridge IGCSE® Physics Coursebook Second Edition>Chapter 18 - Electrical Quantities>Questions>Q 18.12

What is the resistance of a lamp if a current of

2.0 A

flows through it when it is connected to a

12 V

supply?

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Upper Secondary: IGCSE

IMPORTANT

Cambridge IGCSE® Physics Coursebook Second Edition>Chapter 18 - Electrical Quantities>Questions>Q 18.12

If the potential difference across the lamp is increased, will the current flowing increase or decrease?

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Upper Secondary: IGCSE

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Cambridge IGCSE® Physics Coursebook Second Edition>Chapter 18 - Electrical Quantities>Questions>Q 18.14

What

p . d

is needed to make a current of

1.0 A

flow through a

20 Ω

resistor?

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Upper Secondary: IGCSE

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Cambridge IGCSE® Physics Coursebook Second Edition>Chapter 18 - Electrical Quantities>Questions>Q 18.15

What

p . d

would cause a current of

3.0 A

to flow through a

10 Ω

resistor?

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Upper Secondary: IGCSE

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Cambridge IGCSE® Physics Coursebook Second Edition>Chapter 18 - Electrical Quantities>Questions>Q 18.16

What current flows when a

p . d

of

14.5 V

is connected across a

1000 Ω

resistor?

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Upper Secondary: IGCSE

IMPORTANT

Cambridge IGCSE® Physics Coursebook Second Edition>Chapter 18 - Electrical Quantities>Questions>Q 18.17

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Look at the graph given. How can you tell from the graph that the resistors are both ohmic?

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Upper Secondary: IGCSE

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Cambridge IGCSE® Physics Coursebook Second Edition>Chapter 18 - Electrical Quantities>Questions>Q 18.18

Question Image

Look at the graph given. How can you tell from the graph that the lamp's resistance increases as the $p . d$ across it increases.

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Upper Secondary: IGCSE

IMPORTANT

Cambridge IGCSE® Physics Coursebook Second Edition>Chapter 18 - Electrical Quantities>Questions>Q 18.2

A car battery has an emf of

12 V

. How much energy does it transfer to

1 C

of charge flowing around the circuit?