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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
