# Electricity - Paper 1 Flashcards

## To revise the key points from the Electricity topic (paper 1)

Draw the circuit symbol for a lamp

an X in a circle

Draw the circuit symbol for a diode

An arrow head in a circle

Draw the circuit symbol for a resistor

A rectangular box

Draw the circuit symbol for a variable resistor

A rectangular box with a diagonal arrow

Draw the circuit symbol for an LED

Same as a diode with 2 arrows points away

Draw the circuit symbol for a fuse

A rectangular box with a horizontal one running through it

Draw the circuit symbol for a voltmeter

V in a circle

Draw the circuit symbol for an ammeter

A in a circle

Draw the circuit symbol for a thermistor

a rectangular box with a diagonal line through it

Draw the circuit symbol for an LDR

A rectangular box in a circular with 2 arrows pointing towards it

Define Current

Flow of charge (electrons) measured in amps (A)

State the equation that links charge, current and time.

Charge (C)= Current (A) x time (s)

Q = It

What are the units of charge

Coulombs (C)

What is the relationship between current and resistance?

They have an inverse relationship. As resistance increases, current decreases and vice versa

State the equation that links potential difference, current and resistance

Potential difference (V) = Current (A) x resistance (ohms)

V = IR