Exploring Ohm's Law in Practical Circuits

What is the power dissipated in a resistor of 4 ohms when a current of 3 amperes flows through it?

• 12 watts

• 36 watts

• 9 watts

• 48 watts

If a voltage of 10V is applied across a resistor and a current of 2A flows through it, what is the resistance of the resistor?

• 20 ohms

• 5 ohms

• 10 ohms

• 2 ohms

How would you calculate the voltage across a component in a circuit using Ohm's Law?

• Multiply the current by the resistance

• Divide the current by the resistance

• Add the current to the resistance

• Subtract the resistance from the current

In a series circuit with a total resistance of 15 ohms, if the current flowing is 2 amperes, what is the total voltage across the circuit?

• 7.5 volts

• 30 volts

• 15 volts

• 17.5 volts

A 60W light bulb is connected to a 120V power supply. What is the resistance of the light bulb?

• 240 ohms

• 120 ohms

• 60 ohms

• 2 ohms

Using Ohm's Law, how can you increase the current through a resistor without changing the resistance?

• Decrease the voltage

• Increase the voltage

• Use a parallel connection

• Use a series connection

What happens to the current in a circuit if the voltage is kept constant and the resistance is doubled?

• The current is doubled

• The current is halved

• The current remains the same

• The current is quadrupled

In a parallel circuit with two resistors of equal resistance, if the voltage across the circuit is V, what is the voltage across each resistor?

• V/2

• V

• 2V

• V^2

If a resistor in a circuit is overheating, what could be a possible action to reduce the heat generation without changing the circuit's functionality significantly?

• Increase the resistance

• Decrease the resistance

• Increase the voltage

• Decrease the voltage

A variable power supply is connected to a 10-ohm resistor. If the current measured is 5 amperes, what is the voltage setting of the power supply?

• 50V

• 15V

• 5V

• 2V