Resistors Flashcards
1
Q
If wired in a series what is the formula for calculating resistance?
A
R= R1+ R2
2
Q
If wired as a parallel, what is the formula for calculating resistance?
A
1/R=1/R1+1/R2
3
Q
If resistors are wired in a parallel. And consist of R1= 4 Ω , R2= 5 Ω, R3=20 Ω
What is the full resistance?
A
2 Ω
Workings:
1/4 + 1/5 + 1/20 =
5/20 + 4/20 + 1/20 = 10/20
= 1/2
= 2 ohms
4
Q
If wired in a series 2 resistors of 250 Ω and 100 Ω what is the total
Resistance?
A
350 Ω
5
Q
What do you do with circuits that contain series and parallel?
A
Break down the circuit to be as simple as possible. Start with the series. Then move to parallel
6
Q
Why would we want to know the full resistance of a circuit?
A
Because with that combined with the voltage we can use ohms law to calculate the current.
