SDI101m-week2-1

What is the SI unit of electric current?

• Coulomb

• Volt

• Ampere

• Ohm

Which equation correctly defines electric current?

• I = Q/t

• I = t/Q

• I = V.R

• I = Q.t

The resistivity of a material depends on:

• The shape of the conductor

• The applied voltage

• The material itself and its temperature

• The length of the wire only

As the temperature of a metal increases, its resistivity:

• Decreases

• Increases

• Remains constant

• First increases then decreases

The electromotive force (emf) of a battery is:

• The force pushing electrons in a wire

• The terminal voltage when no current flows

• The power per unit charge

• The resistance of the battery

What happens to the total resistance when resistors are added in series?

• It decreases

• It remains the same

• It increases

• It becomes zero

Kirchhoff’s junction rule is based on:

• Conservation of momentum

• Conservation of energy

• Conservation of charge

• Ohm’s law

When analyzing a circuit using Kirchhoff's rules, the sum of currents entering a junction is:

• Greater than the sum of currents leaving

• Equal to the sum of currents leaving

• Always zero

• Dependent on the emf

What is the SI unit of magnetic field strength?

• Tesla

• Weber

• Newton per coulomb

• Volt

A charged particle moving in a magnetic field experiences a force only if:

• The magnetic field is uniform

• It moves perpendicular to the field

• It is at rest

• It is moving parallel to the field