Quiz Time

Most metals are good conductors. Why?

• Their molecules are close together.

• They have high melting point.

• They have many intermolecular spaces through which current can flow.

• They have a large number of free electrons.

What is the purpose of a load in an electric circuit?

• To decrease the current

• To increase the resistance

• To utilize the electric energy

• To share some of the currents

How do you call a device commonly used for remote switching of high current circuits?

• Solenoid

• Electromagnet

• Potentiometer

• Relay

Car batteries are rated in "ampere-hour". this is a measure of their __________.

• emf

• charge

• power

• current

One newton-meter is the same as which one?

• Volt

• Coulomb

• Watt

• Joule

A shorted coil can be detected by __________.

• high resistance

• low resistance

• overheated coil

• both A and B

Which of the following is true in a circuit containing two unequal resistances in parallel?

• Current is the same in both

• Large current flows in larger resistor

• Smaller resistances has smaller conductance

• Potential difference across each is the same

The term "electric pressure" is the same as which of the following?

• Circuit current

• Voltage

• Power demand

• Energy consumption

Which of the following statement is true?

• A rheostat needs three terminals

• An open resistor has a resistance of zero ohm

• Carbon resistors can have a power rating less than 2 W

• Wire-round resistors cannot be used for a rheostat

The resistance of a material varies inversely to which of the following?

• Length of the material

• Cross-sectional area

• Temperature of the material

• Resistivity of the material