Electricity and Magnetism

What is the unit of electric current?

• Volt

• Ampere

• Ohm

• Watt

How do electric charges interact with each other?

• Like charges attract; opposite charges repel.

• Charges do not interact with each other.

• Like charges repel; opposite charges attract.

• All charges attract each other regardless of type.

If the current at a given point in a circuit is 2.5 Amp, then how many electrons pass that point on the circuit in a time period of 1 minute.

• 9.375 x 10²⁰ electrons

• 9.375 x 10¹⁸ electrons

• 9.375 x 10¹⁹ electrons

• 9.375 x 10²¹ electrons

If 500 J of work are required to carry a 40-C charge from one point to another, the potential difference between these two points is: 

• 12.5 V 

• 20,000 V 

• 0.08 V 

• depends on the path 

What is the name of a coil of conducting wire, with or without a core, that behaves like a bar magnet?

• • Electromagnet

• • Conductor

• • Resistor

• • Solenoid

What causes static electricity?

• • Motion of protons

• • Imbalance of charges

• • Excess current flow

• • High temperature

Which of the following materials is an electrical conductor?

• • Rubber

• • Plastic

• • Graphite

• • Wood

In static electricity, what causes a spark to occur?

• • Heat generation

• • Friction between objects

• • Charge imbalance

• • Motion of protons

1. What is the purpose of a fuse in an electrical circuit?

• • To store electric charge

• • To open the circuit in case of excessive current

• • To convert electricity to magnetism

• • To measure electric current

What is the unit of electrical energy used in households?

• • Watt

• Joule

• • Kilowatt-hour (kWh)

• • Ampere