Electrical circuits Flashcards
1
Q
Voltage
A
Energy transferred per unit charge
2
Q
J
A
V*C
3
Q
E
A
Q*V
4
Q
V
A
I*R
5
Q
P
A
I*V
6
Q
E
A
IVt
7
Q
In series
A
Current remains the same and voltage gets used up by the components
8
Q
In parallel
A
Current splits at junctions and voltage remains the same
9
Q
For fixed resistors
A
- y=mx+c
- I=V/R=1/R*V
- m=1/R
10
Q
How to find the I-V graph for a component
A
- Circuit diagram
- Set-up the circuit diagram with the voltmeter in parallel across the component and the ammeter in series
- Use the variable resistor to change the total resistance
- Measure Voltage and Current
- Repeat and average
- Plot average current against average voltage
11
Q
What happens if there are two or more resistors connected in series?
A
Their total resistance is found by adding the individual resistances together
12
Q
Why is current conserved at a junction?
A
In parallel circuits the number of electrons that flow into a junction must be equal to the number that leave each second. This means that currents entering a junction must be equal to those that leave
