Basic Electric Theory

Question 1

1 volt is the electromotive force needed to…

Answer 1

…push 1 amp of current through a resistance of 1ohm

Question 2

Voltage is a) b) c) d)

Answer 2

A) pressure (pressure from an electrical circuit’s power source that pushes charged electrons–current–through a conducting loop, enabling then to do work like illuminating a light)
B) potential difference (potential energy difference between 2 points on a circuit)
C) electromotive force
D) the force moving electrons through a conductor

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Question 3

Resistance

Answer 3

Impedes the flow of current

Question 4

Resistor A) B) C)

Answer 4

A) A passive component to limit the flow of current
B) Measured in ohms
C) Opposite of a conductor

Question 5

Voltage a) b) c) d)

Answer 5

a) The work needed per unit charge to move a positive charge from the first point to a second point

b) The potential difference between 2 points

c) A source of energy or the loss dissipated as heat, or storage of energy (as in a battery)

d) measured in volts

Question 6

Ohm’s Law (equation)

Answer 6

V = IR

V: voltage (volts or V)
I: current (amps or A)
R: resistance (Ohms or Ω)

Question 7

Ohm

Answer 7

Resistance in a circuit transmitting a current of 1 amp, when subjected to a potential difference of 1 volt (an SI unit)