Electricity Flashcards
What is the brown lead in a plug?
Live lead
What is double insulation?
2 layers of plastic to protect you from high voltage mains
What does the fuse do?
Melts if the current passing through is too big, it breaks the circuit
What is the green and yellow lead?
Earth wire
What is the blue lead?
The neutral pin
What does the earth wire protect you from?
Electrocution
What happens when there’s a greater current flowing through a wire?
It becomes hotter, moving electrons transfer energy to fixed metal atoms
What is one watt? _____per______
1 joule per second
What is one amp? _____per____
1 coulomb per second
What is 1 volt? ____per____
Joule per coulomb
In a series circuit what is the current like?
Same at all points
What is the voltage like in a series circuit?
Shared between components
What is the voltage like in parallel?
Same across each branch
What’s does the current do in parallel?
Divides
Where are ammeters connected?
In series
Where are voltmeters connected?
In parallel with a component
What is the relationship between current and voltage in a resistor?
Directly proportional
What is the relationship between current and voltage in a filament bulb?
As the current increases the bulb heats up. Resistance increases so the graph flattens out after a while
What is the relationship between current and voltage in a diode?
No current when voltage is negative, in positive direction, current increases
What is voltage?
Energy transferred per unit charge passed
What can be charged by friction?
Insulators
When can electrostatics be used?
Painting, negative charge in paint attracted to positive charge on car
Photocopying
