At what rate is electrical energy transferred to thermal energy?

A 120 V potential difference is applied to a space heater whose resistance is 14 Ω when hot. (a) At what rate is electrical energy transferred to thermal energy? (b) What is the cost in cents for 5.2 h at US 5.0¢/kW·h?

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  • gp4rts
    Lv 7
    8 years ago
    Best Answer

    The power dissipated is V²/R = 1.03 kW = 1.03 kJ/sec

    5.2 h uses 5.3 kW-hr; 27¢

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