13j_power - Lesson 13j: Power Remember from earlier in the...

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Lesson 13j: Power Remember from earlier in the course we had a formula for relating electricity to energy changing forms. .. V = Δ E q →Δ E = qV ( equation 1 ) But from way back in Science 10 and Physics 20 we had a formula to determine the power as energy is changed from one form to another over a period of time. .. P = W t = Δ E t ( equation 2 ) P = Power measured in Watts (W), the equivalent of J/s W = ∆E = change in energy measured in Joules (J) t = time measured in seconds (s) This formula tells you that power is the rate at which energy is changed from one form to another. For example, a 60W bulb changes electrical energy into light and thermal energy at a rate of 60 Joules per second. We can now play around a bit with these two formulas to get. .. P = Δ E t = qV t ( equation 3 ) Recall that we have a formula for the current flowing through a circuit. .. I = q t ( equation 4 ) So we can simplify the equation 3 by subbing out the parts of equation 4. .. P
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This note was uploaded on 12/02/2011 for the course PHYSICS 235 taught by Professor Staff during the Fall '08 term at Rutgers.

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13j_power - Lesson 13j: Power Remember from earlier in the...

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