Current Electricity (7j) Flashcards
Define Current
Current is the amount of electricity flowing in the circuit.
How is current measured?
It is measured using an ammeter connected in series
What is the unit for currents
The unit for current is Amps (A)
What is a voltmeter?
A device that measures voltage
Define High resistance
High resistance = hard for electricity to flow = small current.
Define low resistance
Low resistance = easy for electricity to flow = large current
What are fuses?
Fuses are used in plugs. They melt if the current gets too high. A fuse has a rating that shows what current it can carry without melting. It is important to use the correct fuse
What are circuit breakers?
Circuit breakers also cut off the current if it gets too high. They protect the ring mains in buildings (loops of parallel circuits)
What are the 3 wires in a cable called and what are the colours?
Neutral wire- blue
Live wire- brown
Earth wire- green and yellow
What is a volt?
The unit for voltage.
Define fuse rating
The largest current a fuse can conduct without melting
Define variable resistor
A resistor whose resistance can be changed.
What is a series circuit?
Series – A circuit in which there is only one loop of wire
What is a parallel circuit?
Parallel – A circuit with two or more branches that split apart and join up again
What happens if one bulb breaks in a series circuit vs a parallel circuit?
In a series circuit, if one bulb breaks, all the others go off however in a parallel circuit if one bulb breaks, the bulbs in the other branches stay on.
