Understanding Electrical Concepts

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

• R = V - I

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

• V = R / I

• I = V + R

In a series circuit, how does the total resistance compare to individual resistances?

• The total resistance is equal to the sum of individual resistances.

• The total resistance is less than the smallest individual resistance.

• The total resistance is the same as the largest individual resistance.

• The total resistance is greater than the individual resistances.

What is the primary difference between series and parallel circuits?

• The primary difference is that series circuits have a single path for current, while parallel circuits have multiple paths.

• Series circuits are always more efficient than parallel circuits.

• Parallel circuits have a single path for current.

• Series circuits can have multiple paths for current.

Define AC and DC current. What are their main applications?

• AC is used in solar panels; DC is used for radio transmission.

• AC is used for power distribution; DC is used in batteries and electronics.

• AC is only used in small appliances; DC is used for high-voltage power lines.

• AC and DC are both used in household wiring without distinction.

What is the function of a NOT gate in digital electronics?

• The NOT gate combines multiple input signals.

• The function of a NOT gate is to invert the input signal.

• The NOT gate outputs the same signal as the input.

• The NOT gate amplifies the input signal.

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

• I_total = I_1 / I_2 / I_3 / ... / I_n

• I_total = I_1 * I_2 * I_3 * ... * I_n

• I_total = I_1 + I_2 + I_3 + ... + I_n

• I_total = I_1 - I_2 - I_3 - ... - I_n

What safety practices should be followed when working with electricity?

• Work in wet conditions for cooling

• Follow safety practices such as using insulated tools, wearing PPE, avoiding wet conditions, and never working on live circuits.

• Use metal tools for better conductivity

• Always work on live circuits to save time

Explain the concept of voltage drop in a circuit.

• Voltage drop is the reduction in voltage across a component in a circuit due to resistance.

• Voltage drop is the total voltage supplied by the power source.

• Voltage drop occurs only in AC circuits, not in DC circuits.

• Voltage drop is the increase in voltage across a component in a circuit.

What is the role of a resistor in an electric circuit?

• A resistor increases current flow in a circuit.

• A resistor acts as a power source in an electric circuit.

• A resistor limits current and controls voltage in an electric circuit.

• A resistor stores electrical energy for later use.

How do logic gates form the basis of digital circuits?

• Logic gates form the basis of digital circuits by performing basic logical operations on binary inputs to produce outputs, enabling complex computations.

• Logic gates are used only in analog circuits.

• Logic gates are irrelevant to digital computations.

• Logic gates can only process decimal numbers.