lightpee
1 Answer
Deleted User
The bulb uses electricity at the rate of 75 watts.
Watts are a rate of using electrical energy, equal to one Joule per second.
Electric energy is also measured in watt-hours, equal to 3600 Joules. As the electric power company uses kW-hours, (1000 watt hours) we will use those.
Your 75 watt bulb, if it burns for an hour, will use 75 watt-hours of electricity. Typical cost for electricity (check your bill) is 10¢ per kW-hr or per 1000 watt-hours. So in one hour your bulb uses 75/1000 x 10¢ or 0.75¢
| 13 years ago. Rating: 1 | |
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