The diagram below shows the direction of flow of current marked by red arrows and the labelled parts — A, B, C, D, E, and F
The name and function of each part is as follows —
A → Ammeter.
An ammeter is an instrument used to measure the magnitude of current flowing in a circuit.
B → Cell.
It acts as a source of direct current for the circuit.
C → key.
It is used to put the current on and off in the circuit.
D → Load.
An appliance which is connected in a circuit. It may be a resistance (e.g., bulb, heater etc.) or a combination of different electrical components.
E → Voltmeter.
A voltmeter is used to measure the potential difference between two points of a circuit.
F → Rheostat.
A rheostat is a device by which resistance in a circuit can be varied continuously.