Ohm's Law: DC Circuit Fundamentals Practice Quiz…

Q: What is the fundamental relationship described by Ohm's Law?

Voltage, current, and resistance — Ohm's Law defines the relationship between voltage, current, and resistance in a circuit.

Q: What is the formula for Ohm's Law?

V = I * R — The formula V = I * R represents Ohm's Law, where V is voltage, I is current, and R is resistance.

Q: If the voltage in a DC circuit is increased, what happens to the current (assuming resistance remains constant)?

The current increases — According to Ohm's Law, increasing the voltage directly increases the current if resistance is constant.

Q: If the resistance in a DC circuit is increased, what happens to the current (assuming voltage remains constant)?

The current decreases — According to Ohm's Law, increasing the resistance decreases the current if the voltage is constant.

Q: What is the unit of measurement for voltage?

Volt (V) — Voltage is measured in Volts (V).

Q: What is the unit of measurement for current?

Ampere (A) — Current is measured in Amperes (A).

Q: What is the unit of measurement for resistance?

Ohm (?) — Resistance is measured in Ohms (?).

Q: In the example provided, if the voltage is 36V and the resistance is 100?, what is the current?

360 mA — Using Ohm's Law (I = V/R), I = 36V / 100? = 0.36A or 360mA.

Q: What component limits current flow and provides a fixed resistance value?

A resistor — A resistor is used to limit current and provides a fixed resistance value.

Q: Why is it important to use the correct resistor value in a circuit?

To prevent overheating or excessive current flow — Using the correct resistor value prevents overheating or excessive current, protecting the components.

Question 1 of 10

What is the fundamental relationship described by Ohm's Law?

Ohm's Law defines the relationship between voltage, current, and resistance in a circuit.

Question 2 of 10

What is the formula for Ohm's Law?

The formula V = I * R represents Ohm's Law, where V is voltage, I is current, and R is resistance.

Question 3 of 10

If the voltage in a DC circuit is increased, what happens to the current (assuming resistance remains constant)?

According to Ohm's Law, increasing the voltage directly increases the current if resistance is constant.

Question 4 of 10

If the resistance in a DC circuit is increased, what happens to the current (assuming voltage remains constant)?

According to Ohm's Law, increasing the resistance decreases the current if the voltage is constant.

Question 5 of 10

What is the unit of measurement for voltage?

Voltage is measured in Volts (V).

Question 6 of 10

What is the unit of measurement for current?

Current is measured in Amperes (A).

Question 7 of 10

What is the unit of measurement for resistance?

Resistance is measured in Ohms (?).

Question 8 of 10

In the example provided, if the voltage is 36V and the resistance is 100?, what is the current?

Using Ohm's Law (I = V/R), I = 36V / 100? = 0.36A or 360mA.

Question 9 of 10

What component limits current flow and provides a fixed resistance value?

A resistor is used to limit current and provides a fixed resistance value.

Question 10 of 10

Why is it important to use the correct resistor value in a circuit?

Using the correct resistor value prevents overheating or excessive current, protecting the components.

Ohm's Law: DC Circuit Fundamentals