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CAIE IGCSE Physics 1.7.3.7 Efficiency a Efficiency Useful Questions

Practise calculating efficiency as useful output energy or power divided by total input energy or power with CAIE IGCSE Physics questions and mark schemes.

Syllabus
2026–2028
Course
Physics 0625

Exam points

  • Calculate efficiency as useful output energy or power divided by total input energy or power.

CAIE IGCSE Physics 1.7.3.7 Efficiency a Efficiency Useful Questions question 1

[Maximum number: 3]

Fig. 2.1 shows solar-powered traffic warning lights.

Fig. 2.1

Fig. 2.1

The energy from the solar cell is stored in a battery.

Question (a)

(a)

The efficiency of the solar cell is 22%. The power supplied to the lights by the cell is 15 W.

[ 3 ]

Question (i)

(i)

State what is meant by 22% efficiency.

[ 1 ]

Question (ii)

(ii)

Calculate the solar power input to the solar cell.
power =

[ 2 ]
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