1.

Which uses more energy, a 250W TV set in 1hour or a 1200W toaster in 10 minutes?

Answer»

Solution :ENERGY used by a TV set of power `P_1=250W` in TIME `t_1= 1h`
`E_1=p_1t_1=250W times 1h=250Wh`
and energy used by a toaster `P_2=1200W`in time `t_2=10 min=10/60 H=1/6 h`
`E_2=P_2t_2=1200W times 1/6h=200Wh`
THUS, it is evident that TV set has used more energy.


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