Electrical circuits

Question 1

Voltage

Answer 1

Energy transferred per unit charge

Question 2

J

Answer 2

V*C

Question 3

E

Answer 3

Q*V

Question 4

V

Answer 4

I*R

Question 5

P

Answer 5

I*V

Question 6

E

Answer 6

IVt

Question 7

In series

Answer 7

Current remains the same and voltage gets used up by the components

Question 8

In parallel

Answer 8

Current splits at junctions and voltage remains the same

Question 9

For fixed resistors

Answer 9

• y=mx+c
• I=V/R=1/R*V
• m=1/R

Question 10

How to find the I-V graph for a component

Answer 10

• 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

Question 11

What happens if there are two or more resistors connected in series?

Answer 11

Their total resistance is found by adding the individual resistances together

Question 12

Why is current conserved at a junction?

Answer 12

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