In the series circuit, if you replaced the 10 resistor with the decade resistanc
ID: 1533544 • Letter: I
Question
In the series circuit, if you replaced the 10 resistor with the decade resistance box and started increasing the value of the box’s resistance from say 10 10,000 , what would you expect to observe for the voltage drop across the fixed 15 resistor and the current in the circuit?
Write out your prediction and then try it out.
In the parallel circuit, if you replaced the 10 resistor with the decade resistance box and started increasing the value of the box’s resistance from say 10 10,000 , what would you expect to observe for the voltage drop across the fixed 15 resistor and the current flowing through the 15 resistor?
Write out your prediction and then try it out.
Explanation / Answer
When the 10 and 15 ohm resistances are in series then increasing the value of 10 ohm resistance would ecrease the current flow in the ckt and therefore in 15 ohm resistance. And if current is decreased, so will be voltage drop as, V = IR.
Now when the two resistances are in parallel combination, then increasing the value of 10 ohm resistance would not change the voltage drop across the 15 ohm resistance and therefore current will also be same.