Ohm's Law

Which equation is correct according to Ohm’s law?

• V = IR

• I = R/V

• R = I/V

• R = IV

Which statement describes the relationship of voltage and current?

• Voltage is directly 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.

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

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.

When the resistance in a circuit remains constant, how are the voltage and current related?

• The current doubles when the voltage doubles because they are directly proportional.

• The current doubles when the voltage doubles because they are inversely proportional

• The current is cut in half when the voltage doubles because they are directly proportional.

• The current is cut in half when the voltage doubles because they are inversely proportional.

According to Ohm’s law, which combination of units is the same as the unit for resistance?

• volt ÷ ampere

• ampere × volt

• volt + ampere

• ampere ÷ volt

To increase the current in a circuit, which can be increased?

• voltage

• resistance

• interference

• ohms

If voltage in a circuit is constant, the current can be cut to half of its original value by changing the resistance to ________ its original value.

• one-fourth

• one-half

• two times

• four times

Jaipal measures a circuit at 1.2 A and 24 . Using Ohm’s law, what can he calculate for the circuit?

• current (C)

• current (I)

• voltage (V)

• voltage (A)

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 Ohms

• 0.5 Ohms

• 60 Ohms

• 240 Ohms

A light bulb has a resistance of 360 . What is the current in the bulb when it has a potential difference of 120 V across it?

• 0.33 A

• 3 A

• 480 A

• 43,200 A