Physical Science Chapter 7 review

What is the unit of voltage?

• Ampere

• Volt

• Ohm

• Watt

Which of the following best defines electrical resistance?

• The force that pushes electric charges through a conductor

• The opposition to the flow of electric current

• The amount of electric charge in a circuit

• The speed at which electric current flows

What does Ohm's Law describe?

• The relationship between voltage, current, and resistance

• The speed of electrical energy flow

• The way resistors increase current

• The direction of current in a circuit

Using Ohm's Law, what is the current if the voltage is 12 volts and the resistance is 6 ohms?

• 2 Amps

• 18 Amps

• 72 Amps

• 0.5 Amps

In a series circuit, how does the total resistance change when more resistors are added?

• It stays the same

• It decreases

• It increases

• It is divided by the number of resistors

What happens to the total current in a parallel circuit as more branches are added?

• The total current increases

• The total current decreases

• The total current remains the same

• The total current becomes zero

How does the current behave differently in a series circuit compared to a parallel circuit?

• In a series circuit, the current is the same throughout; in a parallel circuit, the current is divided among the branches

• In a series circuit, the current is divided among the branches; in a parallel circuit, the current is the same throughout

• In both circuits, the current is divided equally among the components

• In both circuits, the current is the same throughout

What is the correct formula for Ohm's Law?

• Voltage = Current × Resistance

• Voltage = Resistance ÷ Current

• Current = Voltage × Resistance

• Current = Voltage ÷ Resistance

In a series circuit with two resistors of 3 ohms and 5 ohms, what is the total resistance?

• 2 ohms

• 8 ohms

• 15 ohms

• 1.5 ohms

If a circuit has a voltage of 24 volts and a resistance of 4 ohms, what is the current in the circuit?

• 6 Amps

• 2 Amps

• 4 Amps

• 8 Amps