Electricity and Electromagnetism Quiz

Electric current is described as a flow of:

• protons

• neutrons

• electrons

• neutrinos

Which one of the following identifies the sources of an electromotive force?

• Atomic, magnetic, thermal

• Chemical, atomic, thermal

• Chemical, magnetic, thermal

• Chemical, magnetic, atomic

When the current passing through a conductor is increased, the conductor’s temperature will:

• decrease

• stabilise

• fragment

• increase

The SI unit Henry is used for:

• capacitance

• inductance

• frequency

• flux density

Ohm is the SI unit of measurement for:

• resistance

• voltage

• current

• charge

The SI unit for frequency is the:

• Joule

• Mole

• Farad

• Hertz

Resistance, potential difference and electrical current are expressed in the same order as units of:

• ohms, volts, amperes

• ohms, watts, amperes

• ohms, volts, watts

• watts, volts, ohms

Transpose the formula Z2 = R2 + X2 to make R2 the subject.

• R2 = X2 – Z2

• R2 = Z2 – X2

• R2 = Z2 + X2

• R2 = X2 x Z2

If the resistivity of aluminium is 2.65 x 10-8 Ω/metre, the resistance of a 65 metre length of 16mm2 aluminium conductor is:

• 10.77Ω

• 1.108Ω

• 0.0108Ω

• 0.108Ω

A conductor of a simple alternator is 0.4m long and cuts a magnetic field with a magnetic flux density of 1.5 tesla at a velocity of 30m/s. The EMF induced in the conductor will be:

• 1,800V

• 180V

• 18V

• 1.8V