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26 June, 12:22

A 200 Watt incandescent bulb is on for eight hours a day during the month of April. How much will it cost to operate that bulb for the month if AEP's current rate is $0.10/kWh?

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Answers (2)
  1. 26 June, 13:19
    0
    Answer: $4.8

    A 1000W bulb switched on for 1 hr will consume 1KWh (or 1 unit of electricity)

    A 200W bulb switched on for 1 hr will consume 200/1000 units of electricity.

    A 200W bulb switched on for 8hrs will consume 8 * 200 : 1000 = 1.6units

    There are 30days in a April,

    A 200W bulb switched on for 8hrs/day for 30 days will consume

    1.6 * 30 = 48 units of electricity or 48KWh of electricity.

    Cost of operating bulb if AEP's current rate is $0.10/kWh

    48KWh * $0.10/kWh

    = $4.8 monthly.
  2. 26 June, 13:39
    0
    Answer: ¢4. 8

    Explanation:

    Power consumed = 200 watt

    = 200/1000 = 0.2kw

    The bulb lights for 8 hrs a day for the month of april,

    April has 30 days, therefore total hrs = 8 x 30 = 240 hrs

    Energy usage = 0.2 x 240 = 48 kWh

    At the rate of ¢0.10/kWh, total cost will be;

    0.1 x 48 = ¢4.8
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