Circuit Diagrams and Symbols

Front

Circuit diagram symbols include: switch (open), switch (closed), cell, battery, diode, resistor, variable resistor, LED, lamp, fuse, voltmeter, ammeter, thermistor, LDR.

Back

Standard symbols used in circuit diagrams are essential for understanding electrical circuits.

Front

For electrical charge to flow through a closed circuit, the circuit must include a

Back

a source of potential difference

Front

Electric current is a flow of electrical charge.

Back

The size of the electric current is the rate of flow of electrical charge.

Front

Equation linking charge flow, current, and time.

Back

Charge flow = Current × Time

Front

Units for charge flow, current, and time.

Back

Charge in coulombs (C),

current in amps (A),

time in seconds (s).

Front

Current in a single closed loop.

Back

A current has the same value at any point in a single closed loop.

Front

Factors affecting current through a component.

Back

Depends on resistance (R) and potential difference (V) across the component.

Front

Effect of resistance on current.

Back

Greater resistance results in smaller current for a given potential difference.

Front

Equation for potential difference, current, and resistance.

Back

Potential difference = Current × Resistance

Front

Units for potential difference, current, and resistance.

Back

Potential difference (V) in volts (V), current (I) in amperes (A), resistance (R) in ohms (Ω).