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Circuit diagrams use standard symbols to represent components.
A cell symbol in a circuit diagram is represented by a long thin line and a short thick line.
A battery is an assembly of several cells.
The total e.m.f. of a battery in series is the sum of the individual e.m.f.s.
The direction of current in a lamp is crucial for its operation.
A diode allows current to pass in both directions.
An LED emits light when connected correctly to the circuit.
The symbol for a resistor is a zigzag line.
A switch is represented by a symbol with two dots connected by a line.
The symbol for a lamp is a circle with a cross inside.