In a residential building, 50 lamps of 40 W each, 80 lamps of 60 W and 10 lamps of 100 W are simultaneously turned on.
| November 23, 2020 | education
In a residential building, 50 lamps of 40 W each, 80 lamps of 60 W and 10 lamps of 100 W are simultaneously turned on. Determine the current in the external circuit if the voltage in the network is 220 V.
Decision:
P = U * I
I = P / U
to find the total power, you need to do the following:
P = 50 * 40 + 80 * 60 + 10 * 100 = 7800 W
Then we find the current strength:
I = 7800/220 = 35.5 A
Answer: 35.5 A
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