Question

A man has 60w bulbs and a 240w water heater in his apartment. If the bulbs and the water heater are switched on for four hours daily and the cost of electricity is N1.20 per KWh calculare his bill in 30 days

Answer 1

Answer: $N43.2$

Explanation:

Given

Power consumption of bulb and water are $60\ W$ and $240\ W$

If the Devices are on for four hours

Total power of devices $60+240=300\ W$

Energy consumed for 4 hours is

$\Rightarrow 300\times 4=1200 Wh\\\Rightarrow 1.2\ kWh$

For 30 days it is $1.2\times 30=36\ kWh$

Cost for 30 days $36\times 1.2=43.2\ N$