Lampu dialiri arus listrik 500m A.jika hambatannya 140 ohm ,daya lampu adalah
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I= 500 mA ---> 500/1000= 0,5 ampere
R= 140 ohm
Dit:
P= I.V
V= I.R
V= 0,5×140
V= 70 volt
P= 0,5×70
P= 3,5 watt