Current and circuit symbols

What is an electrical current?

a flow of electrical charge

What is the unit of current?

ampere, A

What is potential difference?

the driving force that pushes the charge around

What is the unit of potential difference?

Volts, V

What is resistance?

anything that slows the current down

What is the unit of resistance?

ohms, Ω

Why is a source of potential difference needed for an electrical current?

Electrical charge will only flow around a complete circuit with a source of potential difference

How does the resistance of a component affect the current?

the greater the resistance across a component, the smaller the current that flows (for a given potential difference)

What is the equation for charge flow?

Charge flow ( C, coulombs ) = Current (A, amps) x time (s)

What is the name of the electrical symbol?

cell

What is the name of the electrical symbol?

Resistor

What is the name of the electrical symbol?

Battery

What is the name of the electrical symbol?

Variable resistor

What is the name of the electrical symbol?

switch open

What is the name of the electrical symbol?

ammeter

What is the name of the electrical symbol?

switch closed

What is the name of the electrical symbol?

voltmeter

What is the name of the electrical symbol?

Filament lamp

What is the name of the electrical symbol?

Diode

What is the name of the electrical symbol?

Fuse

What is the name of the electrical symbol?

LDR

What is the name of the electrical symbol?

LED

What is the name of the electrical symbol?

Thermistor

What does a simple circuit contain?

a battery, a switch, and a bulb connected in a single closed loop