3.2 CIRCUITS

Question 1

e.m.f (E)

Answer 1

Electromotive force measures the electrical energy given to the charge
V=W/Q WHERE V in volts, W is the energy, Q is a charge (coulombs)

Question 2

Potential difference Vpd

Answer 2

measures the electrical energy LOST by the charge

Question 3

Electric Current is a

Answer 3

measure of the flow of charge around the circuit and depends on the amount of charge passing any point in a circuit every second
Q=It

Question 4

Current on the same line

Answer 4

Is=I1=I2=In

Question 5

voltage on the same line

Answer 5

Vpd=Vs(supply)
Vs=V1+V2+Vn

Question 6

Parallel circuits

Answer 6

Current: Is=I1+I2
Voltage: Vs=V1=V2

Question 7

Om’s Law

Answer 7

V=IR
V/I=constant R

Question 8

Resistance in circuits

Answer 8

1.** Series** circuits
Rt=R1+R2+Rn
2. Parallel circuit
1/Rt=1/R1+1/R2+1/Rn

Question 9

Power is

W

Answer 9

the range at which energy is converted (перетворений) from one to another

Question 10

Potential divider circuit

Answer 10

https://cdn.savemyexams.co.uk/cdn-cgi/image/w=1920,f=auto/uploads/2020/09/10.2.1-Potential-divider-diagram-and-equation.png
V1=R1/RT x E
V1= R1/R1+R2 x E(for 2 resistors)
V1/R1=V2/R2

WHERE E IS emf

Question 11

A power supply has

Answer 11

internal resistance (r)
formulars:
E= Ir + IR
E= V+Ir where V is the terminal pd

Question 12

In short circuit current

Answer 12

I=E/r

Question 13

OPEN CIRCUIT

Answer 13

I=0

Question 14

SHORT CURCUIT

Answer 14

R=0 and I is very large