U7: Ohm's Law & Circuits Math Review

12. An overhead wire has a potential difference of 30,000 volts. If the current flowing through the wire is 1,000 amperes, what is the resistance of the wire?

• 0.033 ohms

• 30 ohms

• 3.0 x 10^7 ohms

• 3.0 x 10^8 ohms

If the potential difference is 12 volts and the resistance is 5 ohms, what is the current?

• 2.4 A

• 60 A

• 0.417 A

• 17 A

A hair dryer draws 14.0 amps from a 120 volt circuit. How much power did the hair dryer use?

• .1167 Watt

• 8.57 Watt

• 1,680 Watt

• 840 Watt

What is the current of a series circuit with a total resistance of 10 ohms and a voltage of 110 V

• 0.09

• 11.0

• 1100.0

• 10.0

What is the current of a series circuit with values of 5, 9, 17 ohms, with a battery of 12V

• 0.3871

• 3870.0

• 372.0

• 4.4395

A parallel circuit has 6 ohm, 10 ohm, 12 ohm and 15 ohm resistors and a voltage of 10V, what is the current?

answer given in nearest whole number

• 1.0

• 2.0

• 3.0

• 4.0

If the total current in a parallel circuit is 2601A and all three resistors are identical, what is the current through R3 if you have a voltage of 12?

• 867.0
• 205.0
• 354.0
• 976.0

If there is a 4 ohm resistor, 6 ohm resistor, and a 8 ohm resistor in a parallel circuit, what is the total resistance?

• 6.43333333
• 1.8461538
• 0.3246777777
• 1.5321111111

You are given a parallel circuit with three identical resistors of 23 ohms, and two 11V batteries. What is the power of the whole circuit?

• 63.13

• 15.78261

• 11.0

• 7.66667

What is the voltage needed to run a 9.2 ohm toaster on a 5.5 amps?

• 9.2 V

• 5.06 V

• 34.14 V

• 50.6 V