electricity Flashcards
1
Q
main components of an electrical system
A
light bulb, battery, wire voltmeter ammeter resistors
2
Q
how to find voltage
A
V=RI
3
Q
harmful effects of electricity
A
electrical fire, electric shock
4
Q
what are the safety devices
A
fuse and circuit breaker
5
Q
whats a fuse
A
protects from excess current
6
Q
whats a circuit breaker
A
it switches off the electrical supply when large current flows thru
7
Q
definition of power
A
rate of energy converted per unit time
8
Q
how to find power
A
energy over time
9
Q
si unit of power
A
watt(W) or kilowatt(KW)
10
Q
whats the si unit for the I in V=RI
A
Ampere (A)
11
Q
whats the si unit for the V in V=RI
A
Volt(V)
12
Q
whats the si unit for R in V=RI
A
ohm
13
Q
how to find resistance for parallel circuit
A
1/r + 1/r … then flip to get resistance
