JAMB - Physics (1980 - No. 20)
A stand-by generator is connected to fifteen 40 W lamps and musician's 600 W amplifying system. How much energy is used if the generator runs for 6 hours?
3.84k Wh
7.20k Wh
8.40k Wh
12.00k Wh
14.56k Wh
คำอธิบาย
Total power = (15 x 40) + 600
= 1200 watts
Energy(kWh) = \(\frac{1200}{1000}\) x 6
= 7.2 kwH
= 1200 watts
Energy(kWh) = \(\frac{1200}{1000}\) x 6
= 7.2 kwH