Current Elecricity Flashcards
(21 cards)
Conductors
Substances that allow electric current to run through them
Insulators
Substances that do not allow electricity to run freely through them
Closed current
Is needed for the current to flow, if there is a break in the circuit then the current won’t flow
Energy provided
By a battery or power pack, it is needed to move the current around the circuit
The battery pumps electrons
From its negative end around the circuit
The electrons are attracted
Back to the negative end of the battery
Potential difference (voltage)
The difference in electrical pressure between the positive and negative ends of a battery/ power pack
Whenever there is a potential difference
Electricity will flow
This potential difference is known as
Voltage and is measured in volts
Resistance
Is the opposition to the flow of electrons. The unit is the Ohm, and it is measured using an Ohmmeter
If a resistor is paced in an electronic circuit
It will slow down the flow of electrons
Ohnm’s law
States that voltage is directly proportional to current
Electric current
A flow of electric charge
The main supply
230 volts
Ring circuit
Made of live neutral and earth wires
Sockets
Are tapped off at points along the ring circuit. Ring circuits are connected in parallel so if one socket goes off they don’t all go off
Fuse
A safety device that prevents overheating. It will melt when it is too hot, breaking the circuit
Circuit breaker
Is used in the fuse board of the home, and this trips, to stop the flow of current from entering the house
Heating effect
Boil water in a kettle, immersion, heater, electric cooker, fuse in plug
Chemical effect
Electroplating cheap metal with more expensive metal e.g. Silver
Magnetic effect
Electromagnet made with a wire wrapped around a nail, electrical motor, speakers, circuit breaker in fuse board
