A LevelPhysicsEdexcelExam Questions2. MechanicsWork, Energy & Power

Work, Energy & Power (Edexcel A Level Physics): Exam Questions

Exam code: 9PH0

24 mins4 questions

1 mark

An electric motor lifts a load of weight $50 N$ through a vertical height of $1.5 m$ in $4.0 s$ . The motor is connected to a $12 V$ supply and draws a current of $2.0 A$ .

Which of the following expressions gives the efficiency of the motor, as a percentage?

$\frac{12 \times 2.0 \times 4.0}{50 \times 1.5} \times 100$
$\frac{50}{12 \times 2.0 \times 4.0} \times 100$
$\frac{50 \times 1.5}{12 \times 2.0 \times 4.0} \times 100$
$\frac{50 \times 1.5}{12 \times 2.0} \times 100$

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