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E and M : About power - Yahoo!知識+ When we needed to calculate the power loss, why don't we use P=IV, but P=I^2R or v^2/R?Also in a transformer, we calculate the current in the secondary coil by Vs/Vp=Np/Ns, but why not V=IR (given resistance in the secondary coil) ?
phy a.c. circuit - Yahoo!知識+ 99 Q20each of the following three students states a conclusion after learning the formula P=IV, P=I^2 R and P=V^2 /R in electricity.which of the these conclusions is/are correct?1. the power dissipated by any electric appliance can be calculated fromP=IV2
Electric power - Wikipedia, the free encyclopedia In the general case, however, the simple equation P = IV must be replaced by a more complex ...
Power (physics) - Wikipedia, the free encyclopedia If ΔW is the amount of work performed during a period of time of duration Δt, the average power Pavg ...
PIV - Wikipedia, the free encyclopedia P = IV, the formula describing power in terms of current and voltage. Peripheral intravenous catheter or ...
交流電線的發熱功率,可用P=IV 計算嗎? - Yahoo!奇摩知識+ 2012年2月24日 - 目前的電機專業教育已走入死胡同,學校的書你會喜歡、會看得懂才怪,高工、大學電機科 ...
Does Power = Current x Voltage? (P=IV?)? - Yahoo Answers 2011年12月29日 - Increasing the voltage allows a lower current for the same power, and the lower current ...
BBC - GCSE Bitesize: P = IV and fuses A secondary school revision resource for AQA Additional GCSE Science about electricity charge, current ...
power - What is the name of the equation P=IV? - Electrical ... 2013年11月5日 - Ohm's law is \$V=IR\$, but what is the equation \$P=IV\$ called? I've never heard ...