Understanding DC Circuits

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

• V = R / I

• I = V + R

• R = V - I

• Ohm's Law is expressed as V = I * 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 formula for calculating total resistance in a parallel circuit?

• R_total = R1 + R2 + R3 + ... + Rn

• R_total = R1 * R2 * R3 * ... * Rn

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

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

How do you apply Kirchhoff's Voltage Law in circuit analysis?

• Sum the voltage rises and drops around a closed loop and set the total equal to zero.

• Measure the voltage at each component and average them.

• Count the number of components in the circuit and multiply by the voltage.

• Add all resistances in the circuit and set the total equal to the current.

What is the relationship between power, voltage, and current in a DC circuit?

• Power is the sum of voltage and current (P = V + I) in a DC circuit.

• Power is the difference between voltage and current (P = V - I) in a DC circuit.

• Power is the product of voltage and current (P = V * I) in a DC circuit.

• Power is the ratio of voltage to current (P = V / I) in a DC circuit.

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

• I = V + R_total

• I = V / R_total

• I = V * R_total

• I = R_total / V

What is the effect of adding more resistors in parallel on the total resistance?

• The total resistance fluctuates randomly.

• The total resistance decreases.

• The total resistance remains the same.

• The total resistance increases.

Explain the difference between Kirchhoff's Current Law and Kirchhoff's Voltage Law.

• KCL deals with current at junctions, while KVL deals with voltage in closed loops.

• KCL is used for AC circuits, while KVL is used for DC circuits.

• KCL applies to resistors only, while KVL applies to capacitors only.

• KCL measures voltage at junctions, while KVL measures current in loops.

How do you determine the equivalent resistance of a combination of series and parallel resistors?

• Use only the smallest resistor value for the entire combination.

• Add all resistances directly without considering their arrangement.

• Multiply all resistances together to find the total resistance.

• Calculate series resistances by summing them and parallel resistances using the reciprocal formula.

What is the significance of the power rating of a resistor in a DC circuit?

• The power rating determines the resistor's physical size.

• The power rating of a resistor is significant because it determines the maximum power the resistor can handle without failure.

• The power rating is irrelevant in a DC circuit.

• The power rating indicates the color of the resistor.