1. If the voltage impressed across a circuit is constant but the resistance increases by a factor of 15. By what factor does the current change?
2. If the resistance of a circuit remains constant while the voltage across the circuit decreases by a factor of 12, by what factor does the current change?
3.A diode converts AC to pulsed DC. What electric device smooths that pulsed DC to a smoother DC?
physics - Henry, Friday, July 16, 2010 at 2:10pm
1.Increasing the resistance by a factor of 15 means multiplying the resistance
by 15. Since the current is inversely
proportional to the resistance,when the resistance is multiplied by 15,
the current is divided by 15. So the
current is decreased by a factor of 15.
2. Decreasing the voltage by a factor of 12 means dividing it by 12.Since the current is directly proportional to the voltage,it is also divided by 12. In other words, the current is
decreased by a factor of 12 also.
Mathematically,Current(I) = V/R.
3. A capacitor (also called a condenser)