10.1 Voltage and resistance Flashcards
what is voltage?
a measure of energy in circuit
what is voltmeter
device for measuring voltage (unit: volts (V))
define resistance
a measure of how difficult it is for current to flow. (measure in ohms Ω)
define resistor
the device which resists the flow of current
Why is it important for all the cells to be connected the same way round?
Because if it isn’t connected the same way round, there will be a break in the circuit
What name is given to material which have very low resistance?
Good conductor
What name is given to material which have very high resistance?
Insulator
What is the formula for current?
current (I) = voltage/resistance
What is current?
the rate of the flow of electrons. It’s measured in amperes, which are also called amps
What does an ammeter do?
It measures current