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Grade 8 · Physics

Grade 8 Electricity & circuits (Physics) worksheet

20 questions on electricity & circuits. The answer key is a separate download.

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What is on the worksheet

  1. A model device uses constant power 450 W for 4 h. Find the energy in kilowatt-hours. Round to 3 decimal places if needed. Answer in kWh.

  2. An ohmic resistor of 16 Ω has potential difference 60 V. Find current. This is a paper calculation, not a construction instruction. Round to 3 decimal places if needed. Answer in A.

  3. A constant current of 1.2 A flows for 87 s. Find transferred charge. Round to 3 decimal places if needed. Answer in C.

  4. An ohmic resistor of 60 Ω has potential difference 34 V. Find current. This is a paper calculation, not a construction instruction. Round to 3 decimal places if needed. Answer in A.

  5. An ohmic resistor of 70 Ω has potential difference 49 V. Find current. This is a paper calculation, not a construction instruction. Round to 3 decimal places if needed. Answer in A.

  6. An ohmic resistor of 18 Ω has potential difference 47 V. Find current. This is a paper calculation, not a construction instruction. Round to 3 decimal places if needed. Answer in A.

  7. An ohmic resistor of 11 Ω has potential difference 20 V. Find current. This is a paper calculation, not a construction instruction. Round to 3 decimal places if needed. Answer in A.

  8. An ohmic resistor of 31 Ω has potential difference 34 V. Find current. This is a paper calculation, not a construction instruction. Round to 3 decimal places if needed. Answer in A.

  9. A constant current of 1 A flows for 46 s. Find transferred charge. Round to 3 decimal places if needed. Answer in C.

  10. A constant current of 2.5 A flows for 91 s. Find transferred charge. Round to 3 decimal places if needed. Answer in C.

  11. A constant current of 1 A flows for 12 s. Find transferred charge. Round to 3 decimal places if needed. Answer in C.

  12. A model device uses constant power 1425 W for 7 h. Find the energy in kilowatt-hours. Round to 3 decimal places if needed. Answer in kWh.

  13. A model device uses constant power 600 W for 16 h. Find the energy in kilowatt-hours. Round to 3 decimal places if needed. Answer in kWh.

  14. An ohmic resistor of 1 Ω has potential difference 38 V. Find current. This is a paper calculation, not a construction instruction. Round to 3 decimal places if needed. Answer in A.

  15. An ohmic resistor of 24 Ω has potential difference 9 V. Find current. This is a paper calculation, not a construction instruction. Round to 3 decimal places if needed. Answer in A.

  16. A constant current of 3.2 A flows for 34 s. Find transferred charge. Round to 3 decimal places if needed. Answer in C.

  17. A model device uses constant power 1000 W for 12 h. Find the energy in kilowatt-hours. Round to 3 decimal places if needed. Answer in kWh.

  18. An ohmic resistor of 17 Ω has potential difference 26 V. Find current. This is a paper calculation, not a construction instruction. Round to 3 decimal places if needed. Answer in A.

  19. A model device uses constant power 900 W for 10 h. Find the energy in kilowatt-hours. Round to 3 decimal places if needed. Answer in kWh.

  20. A model device uses constant power 1050 W for 9 h. Find the energy in kilowatt-hours. Round to 3 decimal places if needed. Answer in kWh.

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