Some students carry out investigations with an electric motor - Edexcel - GCSE Physics - Question 1 - 2012 - Paper 1
Question 1
Some students carry out investigations with an electric motor.
(a) Complete the sentence by putting a cross (✔) in the box next to your answer.
The students read t... show full transcript
Worked Solution & Example Answer:Some students carry out investigations with an electric motor - Edexcel - GCSE Physics - Question 1 - 2012 - Paper 1
Step 1
(a) Complete the sentence by putting a cross (✔) in the box next to your answer.
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Answer
The correct answer is D: conservation of energy. This is because the statement indicates that all supplied energy is eventually transformed into thermal energy, which aligns with the principle of conservation of energy.
Step 2
(b) Calculate the input power to the motor. State the unit.
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Answer
To calculate the input power (P) to the motor, use the formula:
P=VimesI
Where:
V is the voltage (6 V)
I is the current (0.5 A)
Calculating:
P=6extVimes0.5extA=3extW
Thus, the input power to the motor is 3 watts (W).
Step 3
(c)(i) How much energy is wasted?
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Answer
To find the wasted energy, subtract the energy transferred to the weight from the input energy:
Wasted energy = Input energy - Energy transferred
Wastedextenergy=200extJ−50extJ=150extJ
Thus, 150 J of energy is wasted.
Step 4
(c)(ii) Calculate the efficiency of the motor.
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