Which statement is true? a) current varies throughout a parallel circuit. b) current stays the same throughout a parallel circuit.

Correct answer is A.

In a parallel circuit, the voltage is same across all the branches however the current in each branch is different and depends on the resistance of that branch. The higher the resistance, the lower the current.

In a series circuit, the voltage across each resistive element is different and depends on the resistance of that element. Higher the resistance, larger will be the voltage drop. However, the current throughout the series circuit is the same as there is only path in a series circuit.

Points to Remember:
1) In series circuit current remains the same and voltage varies
2) In parallel circuit voltage remains the same and current varies

Electoral current force mechanical advantage if the wheel and axle is 2 n and the output force is 20 n