Electricity - Current Flashcards
Good Conductor
An electric current is caused by the flow of electrons through a good conductor such as metal
Good insulator
Does not allow electric current to flow e.g. wool, air
Electric current
Is a flow of electric charge, unit is ampere
Conductors
Substances which allow electric currents to flow through them freely
Insulators
Substances which do not allow electric currents to flow through them
Closed Circuit
Is needed for the current to flow
If there is a break in the circuit
the current won’t flow and the electrical energy can’t get through
Battery pumps electrons
From it’s negative end around a circuit
Electrons will move
From areas of high electrical pressure to areas of low electrical pressure
High Electrical Pressure
The negative end of the battery
Low Electrical Pressure
The positive end of the battery
Potential Difference
The difference in electrical pressure between the positive and negative ends
Voltage
This potential difference is known as voltage and is measured in volts
Resistance
The opposition to the flow of electrons, the unit is the Ohm (Ω), and it is measured using an Ohmmeter
Ohms Law
Ohm’s law states that voltage is directly proportional to current
