Current, charge, voltage and resistance

Question 1

Give the equation that links voltage, current and resistance

Answer 1

V = IR

Question 2

Give the three power equations

Answer 2

P = E/t
P = IV
P = I²R

Question 3

Give the equation that links energy, voltage and charge

Answer 3

E = QV

Question 4

Define electric current

Answer 4

The rate of flow of charge
(Coulombs per second)
(I = Q/t)

Question 5

Define voltage

Answer 5

The amount of energy transferred by each coulomb of charge
(Joules per coulomb)
(V = E/Q)

Question 6

Define power

Answer 6

The amount of energy transferred per unit time
(Joules per second)
(P = E/t)

Question 7

Define resistance

Answer 7

The amount a material resists the flow of electric current
(R = V/I)

Question 8

Give the equation and unit for resistivity

Answer 8

ρ = RA/L
Ωm

Question 9

What is a superconductor?

Answer 9

A material with zero resistivity at or below the critical temperature

(This also causes the voltage to be zero)

Question 10

What is the rate of flow of charge?

Answer 10

Electric current

Question 11

What is the amount of energy transferred by each coulomb of charge?

Answer 11

Voltage

Question 12

What is the amount of energy transferred per unit time?

Answer 12

Power

Question 13

What is the amount a material resists the flow of electric current?

Answer 13

Resistance