An electric bulb is rated at 60w, 240v. Calculate it's resistance if the voltage drops to 192v, calculate the energy consumed consumed and the current drawn by the bulb.
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P=60W
V=240V
P=V^2/R
R=V^2/P
R=240×240/60
R=960 ohm
If V=192V
P=V^2/R
P=192×192/960
P=38.4 W
Now, P=VI
I=P/V
I=38.4/192
I=0.2A
V=240V
P=V^2/R
R=V^2/P
R=240×240/60
R=960 ohm
If V=192V
P=V^2/R
P=192×192/960
P=38.4 W
Now, P=VI
I=P/V
I=38.4/192
I=0.2A
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