posted by Billy .
An electric space heater draws 15.5 A from a 120 V source. It is operated, on the average, for 4.0 h each day.
(b) How much energy in kWh does in consume in 30 days?
(c) At 11 per kWh, how much does it cost to operate the heater for 30 days?
15.5A * 120V * 1W/VA* 4h/day * 1kWh/1000Wh * 30day = 223.2 kWh
now multiply by rate to get cost