Ammeter 3 reads 3 A
Ammeter 3 reads 3 A. This is because the
total current* flowing from a cell* in a
parallel circuit equals the sum of all
the currents flowing in the loops.
To explain why, we'll show you how
the current flows through the circuit. We'll show you this in four stages...
A full current flows
out from the positive terminal and reaches Junction X:
At Junction X the current splits.
current splits equally because the lamps are
The two "half"
currents flow through the two loops.
Junction Y the two "half" currents re-join:
A full current then
flows back to the negative terminal.
(We hope you noticed that we used conventional current in our explanation!)