Ohms and Power Law

An MP3 player uses a standard 9 V battery. How

much resistance is in the circuit if it uses a current of

0.003A?

• 0.0003Ω

• 0.027Ω

• 300Ω

• 3,000Ω

Calculate the power of a motor that draws a current of 5 A when connected to a 12 volt battery.

• 416W

• 0.416W

• 2.4W

• 60W

Tommy runs his juicer every morning. The juicer uses 120 W of Power and the current supplied is 3.2 A. How many volts are necessary to run the juicer?

• 26 V

• 0.026 V

• 37.5 V

• 384 V

Calculate the total power through the circuit.

• 0.576 W

• 0.0048 W

• 4.8 W

• 3,000 W

Which equation is used to calculate power?

• R/V²

• R x I²

• I² x V

• V x R²

Calculate the power rating of a home appliance (in kilowatts) that has a resistance 160k ohms when plugged into a 120-volt outlet.

• 9 W

• 0.09 W

• 0.9 W

• 90 W

Calculate the resistance of the circuit.

• 2.4 Ω

• 240 Ω

• 2,400 Ω

• 24,000 Ω

Calculate the power in the circuit.

• 27m W

• 27 W

• 9 W

• 2.7m W

Calculate the resistance in the circuit. Answer must be in standard notation.

A toaster is plugged into a 80 W household circuit. It draws 2 amps of current. What is the resistance?