2.1 Electric current and charge

What is the unit of electric current?

• A) J

• B) C

• C) A

• D) V

What does the 'n' represent in the equation I = nAve?

• A) n = free electron density

• B) n = number of free electrons

• C) n = number of free electrons per square metre

• D) n = number of free electrons per cubic metre

What is the equation relating current, I, charge, Q and time, t?

What is the definition of the ampere?

• A) One coulomb of electrical charge

• B) One coulomb of electrical charge moving past a specific point in one second

• C) One joule of electrical potential converted in some other form of energy per coulomb of charge

• D) One ohm.metre

What is the formula for calculating electrical resistance?

• A) R = I / V

• B) R = V / I

• C) R = I * V

• D) R = I + V

What is the unit of electrical resistance?

• A) J

• B) C

• C) A

• D) Ω

What is the definition of electric current?

• A) The rate of flow of electric charge.

• B) The flow of electric charge.

• C) This is the rate of flow of electric voltage.

• D) The current in a metal wire at constant temperature is

  proportional to the pd across it.

What is the unit of electric charge?

• A) As

• B) C

• C) V

• D) A

One ampere of current represents one .................... of electrical charge moving past a specific point in one second

Current is the .......... of flow of electric charge