> /1.y bjbj A{{=JJJJJ^^^8^)++++++$TOJOJJddJJ))Σ8+z0J OO : Electric Power (P = W / t & P = VI)
1. Calculate the power of a television that uses 1200 J of energy in 4 seconds.
2. Calculate the power of a fire that uses 20 000 J of energy in 8 seconds.
3. Calculate the power of a drill that uses 36 000 J of energy in 1 minute.
4. Calculate the power of a radio that uses 144 000 J of energy in 2 hours.
5. Calculate the power of a kettle that uses 7.2 M J of energy in 120 minutes.
6. How much energy does a light bulb of power 60 W give off in 12 seconds?
7. How much energy does an electric fire of power 3000 W give off in 1 minute?
8. How much energy does a shower of power 7 kW give off in 300 seconds?
9. How much energy does a light bulb of power 40 W give off in 6 hours?
10. How much energy does a kettle of power 1.5 kW give off in 3 minutes?
11. Calculate the time taken for a television of power 200W to use 1000 J of energy.
12. Calculate the time taken for a fire of power 3000W to use 60 000 J of energy.
13. Calculate the time taken for a drill of power 150W to use 25 J of energy.
14. Calculate the time taken for a radio of power 2W to use 4 kJ of energy.
15. Calculate the time taken for a kettle of power 2kW to use 1 MJ of energy.
16. Calculate the power of a television that requires a current of 2A for a voltage of 230V.
17. Calculate the power of an electric fire that requires a current of 13A for a voltage of 230V.
18. Calculate the power of a light bulb that requires a current of 0.5A for a voltage of 230V.
19. Calculate the power of a charger that requires a current of 15mA for a voltage of 230V.
20. Calculate the power of a torch bulb that requires a current of 200mA for a voltage of 6V.
21. Calculate the current drawn when a microwave of power 690W is connected to a 230V supply.
22. Calculate the current drawn when a kettle of power 2000W is connected to a 230V supply.
23. Calculate the current drawn when a washer of power 3kW is connected to a 230V supply.
24. Calculate the current drawn when a stereo of power 100W is connected to a 230V supply.
25. Calculate the current drawn when an electric clock of power 20W is connected to a 230V supply.
26. Calculate the voltage required by a television of power 690W and current 3A.
27. Calculate the voltage required by an electric fire of power 2200W and current 20A.
28. Calculate the voltage required by a light bulb of power 24W and current 4A.
29. Calculate the voltage required by a charger of power 6W and current 500mA.
30. Calculate the voltage required by an electric motor of power 6kW and current 15A.
31. Calculate the power of a television that uses 90 k J of energy in 3 minutes.
32. How much energy does a light bulb of power 150 W give off in 2 hours?
33. Calculate the time taken for a computer of power 300W to use 60 kJ of energy.
34. Calculate the power of a television that requires a current of 30A for a voltage of 12V.
35. Calculate the current drawn when a cooker of power 4 kW is connected to a 230V supply.
36. Calculate the voltage required by a indicator light of power 50 mW and current 0.025A.
Equations to use:
power = energy / time
energy = power x time
time = energy / power
power = voltage x current
current = power / voltage
voltage = power /current
KT TIME \@ "dd MMMM yyyy" 15 February 2012
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