Understanding Ohm's Law

Who discovered the relationship between voltage, current, and resistance in a DC circuit?

• Albert Einstein

• Isaac Newton

• Nikola Tesla

• George Ohm

What happens to resistance when the temperature of a material increases?

• Resistance decreases

• Resistance increases

• Resistance becomes zero

• Resistance remains constant

In Ohm's Law, what is the unit of measurement for current?

• Amperes

• Ohms

• Volts

• Watts

Which formula represents Ohm's Law for calculating current?

• P = V * I

• I = V / R

• V = I * R

• R = V / I

What is the purpose of the Ohm's Law triangle?

• To determine electrical energy

• To measure temperature

• To memorize the formulas for voltage, current, and resistance

• To calculate power

If the voltage in a circuit is increased while resistance remains constant, what happens to the current?

• Current decreases

• Current becomes zero

• Current remains the same

• Current increases

How do you calculate resistance using Ohm's Law?

• R = I / V

• R = V * I

• R = V / I

• R = I * V

In a circuit with a constant voltage, what happens to the current if the resistance is increased?

• Current decreases

• Current becomes zero

• Current remains the same

• Current increases

What is the current through a 2-ohm resistor if the voltage is 9 volts?

• 5.5 amperes

• 3.5 amperes

• 2.5 amperes

• 4.5 amperes

What voltage is needed to produce 5 amperes through a 20-ohm coil?

• 50 volts

• 75 volts

• 100 volts

• 125 volts