Electric Power (VCE SSCE Physics): Quizzes

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Electric Power
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What is the definition of power in physics?

Rate of energy transformation

What does 1 W1 \text{ W} equal?

1 J⋅s−11 \text{ J} \cdot \text{s}^{-1}

A 2 kW2 \text{ kW} kettle runs for 60 s60 \text{ s}. How much energy is delivered?

120 kJ120 \text{ kJ}

A light bulb at 12 V12 \text{ V} draws 0.5 A0.5 \text{ A}. What power does it use?

6 W6 \text{ W}

When is P=I2RP = I^2R especially useful?

Calculating power loss in wires

If current doubles, power loss in a wire increases by what factor?

Four

Do parallel or series circuits use more power with same components at same voltage?

Parallel circuits

Why are household circuits wired in parallel?

Independent operation of appliances

Which formula should you use if you know voltage and resistance but not current?

P=V2RP = \frac{V^2}{R}

A 10 A10 \text{ A} current flows through a 5 Ω5 \, \Omega cable. What power is lost as heat?

500 W500 \text{ W}

Explore VCE SSCE Physics Revision Notes by Topics

Charge (Q) and Current (I)

Electrical Energy and Potential Difference

Modelling Resistance in Series Circuits

Modelling Resistance in Parallel Circuits

Electric Power

Explore VCE SSCE Physics Model Answers by Topics

Charge (Q) and Current (I)

Electrical Energy and Potential Difference

Modelling Resistance in Series Circuits

Modelling Resistance in Parallel Circuits

Electric Power

Explore VCE SSCE Physics Flashcards by Topics

Charge (Q) and Current (I)

Electrical Energy and Potential Difference

Modelling Resistance in Series Circuits

Modelling Resistance in Parallel Circuits

Electric Power

Explore VCE SSCE Physics Exam Questions by Topics

Charge (Q) and Current (I)

Electrical Energy and Potential Difference

Modelling Resistance in Series Circuits

Modelling Resistance in Parallel Circuits

Electric Power

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