Exploring Circuit Laws and Resistors

Which of the following equations represents Ohm's Law?

If a circuit has a current of 3 A and a resistance of 4 Ω, what is the voltage across the circuit according to Ohm's Law?

• 7 V

• 12 V

• 1.33 V

• 0.75 V

Faraday's Law of Induction states that the induced electromotive force (emf) in any closed circuit is equal to the rate of change of the magnetic flux through the circuit. Which of the following is the correct expression for this law?

What is the total resistance of three resistors in series with resistances of 2 Ω, 3 Ω, and 5 Ω?

• 10 Ω

• 5 Ω

• 15 Ω

• 1 Ω

Calculate the total resistance of two resistors in parallel with resistances of 6 Ω and 3 Ω.

• 9 Ω

• 2 Ω

• 1.5 Ω

• 4 Ω

In a circuit, if the voltage is doubled and the resistance remains constant, what happens to the current?

• It remains the same

• It is halved

• It is doubled

• It is quadrupled

Which of the following best describes the relationship between voltage and current in a purely resistive circuit?

• They are inversely proportional

• They are directly proportional

• Voltage is constant regardless of current

• Current is constant regardless of voltage

If a coil of wire is moved through a magnetic field and an emf is induced, which of the following factors will increase the magnitude of the induced emf?

• Decreasing the speed of the coil

• Increasing the number of turns in the coil

• Decreasing the strength of the magnetic field

• Increasing the resistance of the coil

What is the total resistance of four resistors in series with resistances of 1 Ω, 2 Ω, 3 Ω, and 4 Ω?

• 10 Ω

• 9 Ω

• 8 Ω

• 7 Ω

Calculate the total resistance of three resistors in parallel with resistances of 4 Ω, 4 Ω, and 4 Ω.

• 12 Ω

• 1.33 Ω

• 4 Ω

• 1.5 Ω