Understanding Electrical Science Concepts

What is Ohm's Law?

Which of the following is a characteristic of AC circuits?

• Current flows in one direction only

• Voltage remains constant

• Current changes direction periodically

• Requires a battery to operate

What is the primary difference between AC and DC circuits?

• AC circuits have higher voltage

• DC circuits are more efficient

• AC circuits have alternating current, while DC circuits have direct current

• DC circuits are used in homes

Which of the following is a standard unit of electrical resistance?

• Ampere

• Volt

• Ohm

• Watt

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

• To increase current flow

• To protect the circuit from overcurrent

• To store electrical energy

• To convert AC to DC

Which of the following is a common electrical safety standard in Great Britain?

• IEC 60364

• NEC 2020

• BS 7671

• IEEE 1584

What is the function of a capacitor in a circuit?

• To resist the flow of current

• To store electrical energy

• To amplify signals

• To convert electrical energy to mechanical energy

Which component is used to control the flow of current in a circuit?

• Resistor

• Inductor

• Transistor

• Diode

What is the unit of electrical power?

• Joule

• Watt

• Coulomb

• Volt

Which of the following is a characteristic of DC circuits?

• Current changes direction periodically

• Voltage fluctuates

• Current flows in one direction

• Requires an inverter