Ohm's Law and Electric Current Quiz

What is the formula for Ohm's Law?

• V = R / I

• V = I * R

• V = I / R

• V = I + R

If a resistor has a resistance of 750 ohms and a current of 0.35 amperes flows through it, what is the voltage across the resistor?

• 300 volts

• 263 volts

• 200 volts

• 150 volts

A hairdryer draws 6.5 amps of current from a 120-volt outlet. What is the resistance of the hairdryer?

• 20 ohms

• 18.5 ohms

• 15 ohms

• 25 ohms

How much charge passes through the hairdryer in five minutes if it draws 6.5 amps?

• 900 coulombs

• 850 coulombs

• 1000 coulombs

• 950 coulombs

An electric heater has a resistance of 10.6 ohms and is connected to a 240-volt source. What is the current flowing through the heater?

• 18 amperes

• 22.6 amperes

• 20 amperes

• 25 amperes

What is the resistance of the human arm if a voltage of 100 millivolts results in a current of 12.5 milliamperes?

• 6 ohms

• 12 ohms

• 10 ohms

• 8 ohms

If a person with wet skin has a body resistance of 400 ohms and touches a 120-volt source, what is the current through their body?

• 0.2 amperes

• 0.5 amperes

• 0.4 amperes

• 0.3 amperes

What is the unit of electric current?

• Ampere

• Ohm

• Volt

• Coulomb

Which of the following is a correct rearrangement of Ohm's Law to solve for resistance?

• R = I * V

• R = I / V

• R = V * I

• R = V / I

What is the relationship between charge, current, and time?

• Charge = Current / Time

• Charge = Current * Time

• Charge = Time / Current

• Charge = Current + Time