1. The current in a circuit is 1 amp. What will the current be when the voltage

Question

1. The current in a circuit is 1 amp. What will the current be when the voltage is increased by 50%? ....................... 2. A 10 ? resistor is connected across a 12 V battery. How much current is there through the resistor?..................... 3. Three amperes of current are measured through a 27 ? resistor connected across a voltage source. How much voltage does the source produce? .......................... 4. How much power is dissipated by a 2.4 k resistor in series with a 12V power supply? ..................

Explanation / Answer

1) when i=1 A, v=1*R -----(a)
current when the voltage is increased by 50%= (v+0.5v)/v=1.5A
(R= v from (a) )
2)current through the battery=v/r=12/10=1.2A
3)v=ir=3*27=81V
4)power dissipated=v*v / r =12*12 / 2400=0.06W

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