1. the current i varies directly as the electromotive force E and inversely as the resistance R. If in a system a current of 20 amperes flows through a resistance of 20 ohms with an electromotive force of 100 volts, find the current that 150 volts will send through the system.

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2015-09-18T07:41:32+08:00

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I = kE
      R
I= 20 amp;     E = 100 volts;     R= 20 ohms:     1 amp = volt
                                                                                   ohm
20 amp = k (100 volts)      
                20 ohms

(20 volts) ×  (20 ohms) = k
  ohms        (100 volts) 

400/100 = k
k = 4

If Force is 150 volts, using the the same Resistance 20 ohms, find the current at constant k=4.

I = kE
      R

I = (4) (150 volts)
         (20 ohm)
I =  600 volts
      20 ohms

I = 30 volts/ohms,      where: amps (I) = volts/ohms

I (Current) = 30 amps





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