Question

find the resistance of an electric lamp,if it uses a current 20A when connected to 220V line

Answer 1

Voltage = 220V
Current = 20A
V= I×R
R= V/I
R= 220/20
R= 11 ohm.

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Answer 2

$current(i) = 20a \\ voltage(v) = 220v \\ r = \frac{v}{i} \\ r = \frac{220}{20} \\ = 11ohm \\ resistance \: = 11ohm$