Principles of Electrical Science (Draft)

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

When measuring current flow in a d.c. circuit, an ammeter must be connected:

• using a rectifier

• using a VT

• in series with the load

• in parallel with the load

Instrument B in the figure on the right measures the:

• voltage drop caused by R2

• voltage drop caused by R3

• current through R1

• current through R2