Electricity (P2) Flashcards
what’s another name for voltage
potential difference
what is resistance is inversely proportional to
current
frequency for national grid??
50hertz
mains voltage??
230 volts
what are the 4 factors that affect resistance
materials
length
thickness
temperature
what is resistance
the measure of how hard it is for electrons to move around in electrical circuit
what is current
flow of electrical charge. shown through the letter I
what colours are the neutral and earth wires
what does the earth wire do
neutral = blue
earth= green + yellow
allows path of electricity to flow to the gruond if a fault happens
what’s the fuse
thin wire that melts is too much current is passed through
safety device
if 2 cells are in the same series but are opposite directions what is the overall potential difference
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