Final Practice Problems

If a current of 2 A flows through a resistor of 6 Ω, what is the voltage across the resistor?

• 12 V
• 6 V
• 8 V
• 10 V

A 12 V battery is connected to a 4 Ω resistor. What is the current in the circuit?

• 3 A
• 12 A
• 6 A
• 1 A

A current of 0.5 A flows when 9 V is applied. What is the resistance?

• 18 ohms
• 9 ohms
• 27 ohms
• 4.5 ohms

Two resistors of 3 Ω and 7 Ω are connected in series. A current of 2 A flows through the circuit.

• What is the total resistance?

• What is the total voltage supplied?

• Total Resistance: 5 Ω, Total Voltage: 10 V
• Total Resistance: 10 Ω, Total Voltage: 20 V
• Total Resistance: 15 Ω, Total Voltage: 30 V
• Total Resistance: 8 Ω, Total Voltage: 16 V

13. Resistors of 2 Ω, 5 Ω, and 3 Ω are in series with a 20 V battery.

• What is the total resistance?

• What is the total current?

• Total Resistance: 8 Ω, Total Current: 1.5 A
• Total Resistance: 12 Ω, Total Current: 1.67 A
• Total Resistance: 9 Ω, Total Current: 1.8 A
• Total Resistance: 10 Ω, Total Current: 2 A

A copper wire has a resistance of 2 Ω and carries a current of 5 A. What voltage is applied?

• 10 V
• 20 V
• 5 V
• 15 V

A light bulb operates at 3 A and has a resistance of 40 Ω. What voltage is required to run it?

• 100 V
• 80 V
• 120 V
• 60 V

The speed of sound in air is approximately 343 m/s. If a sound wave has a frequency of 686 Hz, what is its wavelength?

• 1.0 m
• 0.25 m
• 1.5 m
• 0.5 m

Tags

NGSS.HS-PS4-1

A wave travels at 300 m/s and has a wavelength of 0.5 m. What is its frequency?

• 300 Hz
• 600 Hz
• 1500 Hz
• 1200 Hz

Tags

NGSS.HS-PS4-1

A water wave has a frequency of 2 Hz and travels at 4 m/s. What is the wavelength?

• 2 m
• 1 m
• 3 m
• 5 m

Tags

NGSS.HS-PS4-1