Essentials of Electrical Engineering

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

• V = R / I

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

• R = V - I

• I = V + R

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

• R_total = R1 - R2 - R3 - ... - Rn

• R_total = R1 + R2 + R3 + ... + Rn

• R_total = R1 * R2 * R3 * ... * Rn

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

What is the difference between series and parallel circuits?

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

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

• In series circuits, the voltage is the same across all components; in parallel circuits, it varies.

• Series circuits can be easily disconnected; parallel circuits cannot.

Explain the concept of voltage, current, and resistance in a circuit.

• Voltage is the potential difference, current is the flow of charge, and resistance is the opposition to that flow.

• Current is the amount of energy stored in a battery.

• Voltage is the speed of electrons in a circuit.

• Resistance is the measure of voltage in a circuit.

What are Kirchhoff's laws and how are they applied in circuit analysis?

• KVL is used to measure resistance in a circuit.

• Kirchhoff's laws are KCL (current conservation at junctions) and KVL (voltage conservation in loops), used in circuit analysis to calculate unknown currents and voltages.

• Kirchhoff's laws only apply to AC circuits.

• KCL states that voltage is conserved at junctions.

Define the terms AC and DC in the context of electrical circuits.

• AC is Alternating Current; DC is Direct Current.

• AC is a form of static electricity; DC is a form of electromagnetic energy.

• AC is a type of battery; DC is a type of resistor.

• AC stands for Automatic Current; DC stands for Digital Current.

What are the advantages and disadvantages of AC over DC?

• DC can easily power large motors

• AC is always more efficient than DC

• AC is simpler to implement than DC

• Advantages of AC: efficient long-distance transmission, easy voltage transformation, powers large motors. Disadvantages: higher losses in resistive materials, system complexity. Advantages of DC: simpler, lower losses in specific applications. Disadvantages: less efficient for long-distance, complex voltage conversion.

How do you calculate electrical power in a circuit?

• P = V × I

• P = V - I

• P = I / V

• P = V + I

What is the formula for calculating power in AC circuits?

• P = VI

• P = I^2R

• P = VIcos(φ)

• P = V^2/R

List the basic components of an electrical circuit and their functions.

• Resistor, Capacitor, Diode, Transformer

• Battery, Insulator, Relay, Fuse

• Generator, Circuit Breaker, Inductor, Amplifier

• Power Source, Conductors, Load, Switches