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Tutor HuntTest QuestionsPhysics QuestionsYear 10 Physics Questions

 

Power (GCSE Physics)

The following is a GCSE Physics test covering 'Power' from the broader topic Energy. The test is geared towards the AQA exam board style syllabus.
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Below a typical questions that will be covered in this test. You final score will be logged on your account

A heater draws 2.0 A from a 12 V supply. What is its power?
A battery delivers 2.0 × 10^5 J over 1000 s. What is the power and what current flows at 12 V?
A device uses 1500 J of energy in 5 seconds. What is its power?
A wind farm has mean power output 696 MW and supplies 580 000 homes. What is the mean power per home (in W)?
If a transmission cable has a resistance of 0.8 O and carries a current of 500 A, what is the power lost as heat in the cable?
Which equation links power (P), potential difference (V) and current (I)?
Which is the best description of power efficiency?
A resistor in a circuit has 5 V across it and dissipates 20 W. What is the current through it?
A power supply delivers 24 V across a resistor and the current is 3 A. If the resistor is replaced by another with double the resistance, what happens to the power dissipated?
If a device has power rating 1500 W and runs for 30 minutes, what energy in kWh is used?
A kettle is 90% efficient. It requires 3.6 × 10^5 J to boil. How much energy must the mains supply provide?