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Some students carry out investigations with an electric motor - Edexcel - GCSE Physics - Question 1 - 2012 - Paper 1

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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

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 option reflects the principle that energy cannot be created or destroyed, only transformed into other forms.

Step 2

Calculate the input power to the motor. State the unit.

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Answer

Power can be calculated using the formula:

P=VimesIP = V imes I

Substituting the values: P=6Vimes0.5A=3WP = 6 V imes 0.5 A = 3 W

Thus, the input power to the motor is 3 Watts.

Step 3

How much energy is wasted?

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Answer

The wasted energy can be calculated using the formula:

extWastedEnergy=extInputEnergy−extEnergyTransferred ext{Wasted Energy} = ext{Input Energy} - ext{Energy Transferred}

Substituting the values: extWastedEnergy=200J−50J=150J ext{Wasted Energy} = 200 J - 50 J = 150 J

Therefore, the energy wasted is 150 J.

Step 4

Calculate the efficiency of the motor.

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Answer

Efficiency can be calculated using the formula:

ext{Efficiency} = rac{ ext{Useful Energy Output}}{ ext{Total Energy Input}} imes 100

Substituting the values: ext{Efficiency} = rac{50 J}{200 J} imes 100 = 25\%

Thus, the efficiency of the motor is 25%.

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