Question

A radio transfers 270 J of energy electrically, 94.5 J is transferred by sound. Work out the efficiency of this radio. Give your answer as a decimal.

Answer 1

Answer:

The efficiency of this radio is 35%

Explanation:

Given that,

Output work, W_o=94.5\ JW

o

=94.5 J

Input work, W_i=270\ JW

i

=270 J

Explanation:

The efficiency of radio is equal to the output work divided by input work. It is given by :

• n= Wo × 100
• W1
• n= 95.5 × 100
• 270
• n= 35%

So, the efficiency of this radio is 35%. Hence, this is the required solution.