Electrical Quantities

What is the SI unit of electric charge?

• Volt

• Ampere

• Coulomb

• Ohm

Which particles are responsible for carrying charge in a metallic conductor?

• Protons

• Neutrons

• Electrons

• Ions

What happens to the current when the resistance of a circuit doubles, assuming voltage remains constant? (use ohm's law)

• Doubles

• Halves

• Remains the same

• Can't be predicted

The formula for current is:

• ( V x R )

• ( V / R )

• ( R / V )

• ( Q x T )

Which component is used to vary resistance in a circuit?

• Thermistor

• LDR

• Variable resistor

• Diode

A positively charged object will attract:

• Negative charges

• Positive charges

• Neutral objects (remember: neutral objects have protons, neutrons, and electrons where number of protons=number of electrons)

• Both A and C are correct

Which material is a good conductor of electricity?

• Rubber

• Copper

• Glass

• Wood

Ohm's Law is stated as:

• ( I = V / R )

• ( R = I / V )

• ( P = V x I )

• ( Q = I x t )

The resistance of a wire is directly proportional to its:

• Area

• Temperature

• Length

• Material density

The unit of resistance is:

• Joule

• Ohm

• Volt

• Coulomb