Understanding Electrical Concepts

What is Ohm's Law and how is it expressed mathematically?

• Ohm's Law is expressed as V = I * R.

• R = V - I

• V = R / I

• I = V + R

Calculate the current flowing through a circuit with a voltage of 12V and a resistance of 4Ω.

• 2A

• 4A

• 6A

• 3A

Explain the difference between series and parallel circuits.

• Parallel circuits have a single path for current.

• In series circuits, the total resistance is zero.

• Series circuits have a single path for current, while parallel circuits have multiple paths.

• Series circuits can have multiple paths for current.

What is the total resistance in a series circuit with three resistors of 2Ω, 3Ω, and 5Ω?

• 5Ω

• 7Ω

• 8Ω

• 10Ω

How do you calculate the total resistance in a parallel circuit?

• R_total = R1 * R2 * R3 * ... * Rn

• R_total = 1 / (1/R1 + 1/R2 + 1/R3 + ... + 1/Rn)

• R_total = R1 + R2 + R3 + ... + Rn

• R_total = (R1 + R2 + R3 + ... + Rn) / n

What are the main differences between AC and DC current?

• AC is used in batteries while DC is used in outlets.

• AC changes direction periodically; DC flows in one direction.

• DC can be used for long-distance power transmission.

• AC is always safer than DC.

In what applications is AC current typically used?

• Television signals, radio waves, and microwaves

• Solar panels, wind turbines, and batteries

• Household appliances, lighting, industrial machinery, and power transmission.

• Digital devices, computer networks, and software applications

What are the advantages of using DC current in electronic devices?

• Increased energy loss

• Higher voltage fluctuations

• Advantages of using DC current include stable voltage, simpler circuit design, reduced energy loss, higher efficiency for batteries, and easier control.

• More complex circuit design

List three electrical safety practices that should be followed when working with electricity.

• 1. Ensure equipment is properly grounded. 2. Use insulated tools. 3. Wear personal protective equipment (PPE).

• Ignore warning labels on devices.

• Use wet hands when handling electrical equipment.

• Work on live circuits without supervision.

What is the purpose of a circuit breaker?

• To enhance the performance of electrical devices.

• To protect electrical circuits from overloads and faults.

• To provide a constant flow of electricity without interruptions.

• To increase the voltage in electrical circuits.