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Moo!. P1.3 Electrical Energy. Copy this page . Power . This means the more powerful something is, the more energy is transferred every second. Power (watts) = Energy Transferred (joules) Time (seconds) . Copy this page . Power . For example:

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Moo!

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  1. Moo!

  2. P1.3 Electrical Energy

  3. Copy this page Power This means the more powerful something is, the more energy is transferred every second. Power (watts) = Energy Transferred (joules) Time (seconds)

  4. Copy this page Power For example: If a bulb transfers 300 J of electrical energy into light in 3 seconds, the power is: Power = Energy transferred ÷Time Power = 300 (J) ÷ 3 (s) Power = 100 W Power (watts) = Energy Transferred (joules) Time (seconds)

  5. Calculate the power if 30J of energy is transferred in 30 seconds. • Calculate the power if 300J of energy is transferred in 300 seconds. • Calculate the power if 30J of energy is transferred in 300 seconds. • Calculate the power if 30000J of energy is transferred in 30 minutes. • If a torch has a power of 1 W, how much energy is transferred in 1 second? • If a torch has a power of 10 W, how much energy is transferred in 1 second? • If a torch has a power of 1000 W, how much energy is transferred in 1 second? • If a torch has a power of 1 kW, how much energy is transferred in 1 minute? • If a torch has a power of 1 kW, how much energy is transferred in 1 hour? • How long would a 100 W light bulb take to use 100 J of energy? • How long would a 100 W light bulb take to use 10 J of energy? • How long would a 100 W light bulb take to use 1 J of energy? • How long would a 60 W light bulb take to use 10 J of energy? • How long would a 100 W light bulb take to use 100 000 J of energy?

  6. Copy this page Electrical Energy Energy = Power x time [kWh] [kW] [hours] Electrical energy can be measured in kWh. We must convert the power to kW and the time to hours.

  7. For example: If a house uses 3kW of power over a period of 3 hours, calculate the electrical energy transferred. Energy = Power x Time Power = 3 (kW) x 3 (h) Power = 9 kWh

  8. For example: If a house uses 300W of power over a period of 30 minutes, calculate the electrical energy transferred. Energy = Power xTime Power = 0.3 (kW) x 0.5 (h) Power = 0.15 kWh If each kWh costs 14p, how much does it cost? Total cost = number of kWh x cost per kWhTotal cost = 0.15 x 14 Total cost = 2.1p

  9. Practicals • Circus of appliances • SEP energy meter • Household meter

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