Electrical science and technology

Electric current is a flow of

• Electrons

• Neutrons

• Plasma

• Protons

Which one of the following units is used when measuring electrical charge?

• Watt

• Ohm

• Coulomb

• Ampere

A material with a low resistance is said to be

• A good inductor

• A good capacitor

• A good insulator

• A good conductor

Which of the following is correct when connecting electrical measuring instruments?

• Ammeters in parallel, voltmeters in series

• Ammeters in series, voltmeters in parallel

• Ammeters in series, voltmeters in series

• Ammeters in parallel, voltmeters in parallel

The THREE effects of an electric current are

• Chemical, magnetic, thermal

• Thermal, chemical, lighting

• lighting, magnetic, thermal

• Magnetic, chemical, lighting

The value of power, if a current of 2 amps flows when a voltage of 100 volts is applied to a resistor, is

• 5 Watts

• 20 Watts

• 50 Watts

• 200 Watts

If a current of 2 amps flows when a voltage of 100 volts is applied to a resistor, which one of the following is the value of the resistance?

• 5 ohms

• 20 ohms

• 50 ohms

• 200 ohms

A measurement on a plan scale at 1:50 is 2cm. Calculate what this would represent in the real building.

• 0.5m

• 1.0m

• 1.5m

• 2.0m

If a light bulb uses 60 watts of power and is connected to a 120-volt power supply, what is the current flowing through it?

• 0.5 Amps

• 2 Amps

• 180 Amps

• 0.2 Amps

What is the resistance of a resistor that drops a voltage of 10 volts when a current of 2 amps flows through it?

• 20 ohms

• 5 ohms

• 0.2 ohms

• 0.5 ohms