Electricity Flashcards
What is required to make an electric current pass around a circuit?
A complete circuit and a source of energy. E.g. cell or battery
What is the current?
The rate of flow of charge
What is the behaviour of charge carriers inside metals?
They move about inside the metal
What are ions?
Charged atoms or molecules
What is the unit of current?
Amperes (A)
What is the unit of charge?
Coulomb (C)
What is the definition of an ampere?
Magnetic force between two parallel wires when they carry the same current
What is coulomb defined as?
Amount of charge that passes in 1 second if the current is 1 ampere ( A )
What is the formula for the flow of charge?
Charge flow = Current * Change in Time
What is the potential difference defined as?
Work done ( energy converted ) per unit charge moved, unit: volt, v.
What is the formula for voltage?
Voltage = Work done (Joules, J) / Charge (Coulomb, C)
How can you measure the potential difference across a component?
Potential difference can be measured across a component by using a volt meter
