Ohm's Law

Which statement describes the relationship of resistance and current?

• Resistance is directly proportional to current because R = V/I

• Resistance is inversely proportional to current because R = V/I.

• Resistance is directly proportional to current because R = VI.

• Resistance is inversely proportional to current because R = VI.

Which statement describes the relationship of voltage and current?

• Voltage is directly proportional to current because I = V/R.

• Voltage is inversely proportional to current because I = V/R.

• Voltage is directly proportional to current because I = VR.

• Voltage is inversely proportional to current because I = VR.

Which symbol and unit of measurement are used for electric current?

• symbol: A; unit: I

• symbol: C; unit: A

• symbol: I; unit: C

• symbol: I; unit: A

Ohm’s law describes the relationship between which quantities?

• voltage, resistance, and ohms

• resistance, current, and amperes

• current, voltage, and resistance

• amperes, ohms, and current

Aretha measures a circuit at 110 V and 240 . Using Ohm’s law, what can she calculate for the circuit?

• voltage

• ohms

• resistance

• current

A circuit has a current of 2.4 A. The voltage is increased to 4 times its original value, while the resistance stays the same.

How should the resistance change to return the current to its original value if the voltage remains at its increased amount?

• It should decrease to one-half of its value.

• It should decrease to one-fourth of its value.

• It should increase to two times its value.

• It should increase to four times its value.

What is the resistance of a light bulb if a potential difference of 120 V will produce a current of 0.5 A in the bulb?

• 0.0042 Ω

• 0.5 Ω

• 60 Ω

• 240 Ω

Which equation is correct according to Ohm’s law? Check all that apply.

• V = IR

• I = R/V

• R = I/V

• R = IV

• I = V/R

Kaya collects the data shown in the table.

What is the resistance in the circuit?

• 0.05 Ω

• 1.8 Ω

• 5.7 Ω

• 20 Ω

A hair dryer has a resistance of 11.5 . What current does it conduct when it is plugged into a wall outlet that provides 120 V?

• 0.10 A

• 10.4 A

• 109 A

• 1380 A