Science and principles mix

What is the term used to explain opposition to current flow?

• Resistance

• Conductor

• Inductance

• Flux density

What is measured in hertz?

• Watts

• Newton

• Frequency

• Amplitude

The SI unit of energy is the...

• Watts

• Joule

• Coulomb

• Newton

The frequency of an alternating current is the.....

• Number of cycles per second

• Instantaneous value of current

• Time period of one cycle

• Rate of increase and decrease of current

What is magnetic flux density measured in?

• Weber

• Second

• Watt

• Tesla

The ( - ) part of an atom is....

• Proton

• Neutron

• Electron

• Nucleus

The ( + ) part of an atom is.....

• Proton

• Neutron

• Electron

• Nucleus

Which of the following conductors decreases in resistance when temperature is increased?

• Copper

• Carbon

• Aluminium

• Tungsten

Electrical potential generated by chemical means is a.....

• Simple alternator

• Thermocouple

• Filament lamp

• Battery

A good insulating material has...

• Few free electrons

• Many free protons

• Mainly negative ions

• A surplus of electrons