Please solve 8)a)

A: cell , it provides the potential differences across the circuit, so that current passes through it.
B: Ammeter, it measure the current in the circuit.
C. Load Resistance,  that offer a fixed Resistance to the circuit. 
D: voltmeter,  measures the potential differences across the resistance  C.
E: Rheostat, offer variable resistance to the circuit.
F: key, when switched on then allow the current to pass through the circuit. 
Current passes through positive terminal of the battery to negative terminal of the battery.

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