JAMB - Physics (2009 - No. 28)
An electric lamp marked 240v, 60 W is left to operate for an hour. How much energy is generated by the filament?
3.86 x 105J
3.56 x 105J
1.80 x 104J
2.16 x 105J
Giải thích
Energy generated = power X time = 60w x 1h = 60 x 60 x 60 ws = 216000j = 2.16 x 105J