Chapter 8: Ohm's Law & Power Law

What formula is used to calculate current in a circuit?

• I = E x R

• I = E / R

• I = E + R

• I = E - R

What formula is used to calculate voltage in a circuit?

• E= I x R

• E= I / R

• E= I + R

• E = I - R

What formula is used to calculate resistance in a circuit?

• R = E x I

• R = E / I

• R = E + I

• R = E - I

What is the resistance of a circuit in which a current of 3 amperes flows when connected to 90 volts?

• 3 ohms

• 30 ohms

• 93 ohms

• 270 ohms

What is the resistance of a circuit for which the applied voltage is 12 volts and the current flow is 1.5 amperes?

• 18 ohms

• 0.125 ohms

• 8 ohms

• 13.5 ohms

What is the resistance of a circuit that draws 4 amperes from a 12-volt source?

• 3 ohms

• 16 ohms

• 48 ohms

• 8 ohms

What is the current in a circuit with an applied voltage of 120 volts and a resistance of 80 ohms?

• 9600 amperes

• 200 amperes

• 0.667 amperes

• 1.5 amperes

What is the current through a 100-ohm resistor connected across 200 volts?

• 20,000 amperes

• 0.5 amperes

• 2 amperes

• 100 amperes

What is the current through a 24-ohm resistor connected across 240 volts?

• 24,000 amperes

• 0.1 amperes

• 10 amperes

• 216 amperes

What is the voltage across a 2-ohm resistor if a current of 0.5 amperes flows through it?

• 1 volt

• 0.25 volts

• 2.5 volts

• 1.5 volts