the potential difference between the terminal of an electric heater is 60v when it draws a current of 4A from the source. what current will the heater draw if the potential difference is increased to 120v ?
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Given = I = 4 A.
and
v = 60 v
V = IR
R = v/i
→ R = 60/4.
R = 15 ohm
now ,
V = I2R
→ I = 120/15
→ I = 8 A
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