Physics
kbutler5
2016-09-28 04:04:36
An electrician must decide between 3 heaters. The wire that she is using is rated 15A maximum, anything beyond that is a fire hazard. Two of the heaters operate off a standard 120V circuit. One is rated 900W and the other 1800W. The third operates off a 240V circuit and can deliver 3000W of power. Calculate the amount of current for each.
ANSWERS
patrickcajolin
2016-09-28 10:20:38

Use the formula: [latex]P=IV[/latex], where P is power (watts), I is current (amperes) and V is potential difference (volts). For the first heater: [latex]900W = I_{1}*120V[/latex] [latex]I_{1} = 7.5A[/latex] For the second heater: [latex]1800W = I_{2}*120V[/latex] [latex]I_{2} = 15A[/latex] For the third heater: [latex]3000W = I_{3}*240V[/latex] [latex]I_{3} = 12.5A[/latex]

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