A 30-W incandescent lamp is connected to a 120-V source and is left burning continuously in an otherwise dark staircase. Determine: (a) the current through the lamp, (b) the cost of operating the light for one non-leap year if electricity costs 12 cents per kWh.

Question

Accepted Answer

(a) [latex] i=\frac { P }{ V } =\frac { 30 }{ 120 } =0.25 [/latex] A
(b) W=Pt=[latex] 30 imes 360 imes 24Wh=262.8 [/latex] KWh
Cost = $ [latex] 0.12 imes 262.8 [/latex] = $ 31.54

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