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

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).