Current and circuit symbols

What is an electrical current?

The flow of charged particles or electric charge

When will electric charge flow round a complete circuit?

If there is potential difference

What is the unit of current?

Ampere

When does the current have the same value everywhere in the circuit?

In a single

What is potential difference?

Voltage

What is the unit of potential difference?

Volts

What is resistance?

Anything that slows the flow down

What is the unit of resistance?

Ohms

What is the relationship between resistance and potential difference?

The greater the resistance across a component

What is the size of the current?

The rate of flow of charge

What is the unit of charge flow?

Coulomb

What does the cell symbol look like ?

What does the cell do in a circuit?

Act as a power source to provide energy to charges

What does the battery symbol look like ?

What does the battery do in a circuit?

Acts as a power source to provide energy to charges

What does the open switch symbol look like ?

What does the closed switch symbol look like ?

What does the filament lamp (bulb) symbol look like ?

What does the fuse symbol look like ?

What does the fuse do in a circuit?

It melts at a certain current and creates an opening or disconnect in the circuit.

What does the LED symbol look like ?

What does the LED do in a circuit?

Light Emitting Diode - acts as a light source

What does the resistor symbol look like ?

What does the resistor do in a circuit?

Slows down the flow of electricity (current)

What does the variable resistor symbol look like ?

What does the variable resistor do in a circuit?

Allows the current to be varied

What does the ammeter symbol look like ?

What does the voltmeter symbol look like ?

What does the diode symbol look like ?

What does the diode do in a circuit?

Acts like a one-way valve for electricity

What does the LDR symbol look like ?

What does the LDR do in a circuit?

Light Dependent Resistor - Its resistance decreases as the light intensity increases.

What does the thermistor symbol look like ?

What does the thermistor do in a circuit?

Acts as a temperature-sensitive resistor