Quick questions on Electrical power and energy: P = IV and P = I squared R - SQA National 5 Physics

3short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.

What is q1?

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A lamp operates at

12 \text{ V}

and draws

2.0 \text{ A}

. Calculate its power. [2 marks]

What is q2?

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1500 \text{ W}

heater runs for

40 \text{ s}

. Calculate the energy used. [2 marks]

What is q3?

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A current of

3.0 \text{ A}

flows through a

10 \text{ }\Omega

resistor. Calculate the power dissipated. [2 marks]

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