electrical terminology

Question 1

what is potential difference

Answer 1

The difference in voltages between two points in a circuit

Question 2

OHMS law

Answer 2

V= I x R

Question 3

what is voltage, symbols and formula

Answer 3

electrical pressure, the difference in electrical al charge between two points, symbols include;
V = volts
EMF = electromotive force
PD = potential difference

V=E/Q

E=energy in joules
Q = coulombs

Question 4

current is what?

Answer 4

the number of coulombs in a cross section of conductor in one second

Question 5

formula for current

Answer 5

I=Q/t

I = current in amps
Q = charge
t = time

Question 6

1 coulomb of charge in 1 electron

Answer 6

6.24 x 10^18 = 1 amp electrons per second

Question 7

what is resistance?

Answer 7

the opposition to the flow of electric current, its a measurement of the PD required to cause 1 amp to flow through a circuit

Question 8

what is conductance?

Answer 8

this is the reciprocal of resistance

Question 9

formula for conductance

Answer 9

G = 1/R

G = conductance in siemens (S)

Question 10

conductance example
R = 5 ohms

Answer 10

G = 1/5(ohms)

Question 11

what do the number of charges moved per second depend on?

Answer 11

the Electromotive force (EMF) of the supply and the resistance of the circuit

Question 12

in an electrical circuit, what prevents the continued speed of the electrons?

Answer 12

the collision with ions

Question 13

what does an electrical supply do?

Answer 13

it separates charges