electricity Flashcards
1
Q
definition of electric current
A
The rate of flow of electric charges
2
Q
what is E.M.F?
A
It is the energy given by the electrical source to drive a unit of electric charge around a complete circuit.
3
Q
what is P.D?
A
t is the energy given by the electrical source to drive a unit of electric charge through the electrical component
4
Q
definition of resistance
A
It is the ratio of the p.d across it to the current flowing through
5
Q
what does a resistor do?
A
converts electrical energy to heat energy
6
Q
what does a variable resistor do?
A
changes the current in the circuit by controlling the resistance.
7
Q
ammeter, series or parallel?
A
series
8
Q
voltmeter, series or parallel?
A
parallel
9
Q
basic formula is…
A
V=IR
