Circuits

An electric circuit is a closed loop or pathway that allows electric charges to flow.

• True
• False

A resistor is a device that converts chemical energy into electrical energy.

• True
• False

A parallel connection is a type of electrical circuit in which there is a single current pathway.

• True
• False

A series connection is a type of electric circuit in which there are multiple paths.

• True
• False

A resistor is a device that controls current in electric circuits.

• True
• False

An electric current is a flow of charged particles.

• True
• False

Three resistors with values of 4.0 Ω, 6.0 Ω and 8.0 Ω respectively, are connected in series. What is their equivalent resistance?

• 18
• 8.0
• 6.0
• 1.8

If a 325 W heater has a current of 6.0 A, what is the resistance of the heating element?

• 88 Ω
• 54 Ω
• 9.0 Ω
• 11 Ω

If a 75 W light bulb operates at a voltage of 120 V, what is the current in the bulb?

• 0.63 A
• 1.6 A
• 9.0 x 10³ A
• 1.1 x 10^-4 A

Three resistors with values of R₁, R₂ and R₃ are connected in series.
 
Which of the following expresses the total resistance, R₁, of the three resistors?

• R_t = R₁ + R₂ + R₃
• R_t = 1/R₁ + 1/R₂ + 1/R₃
• R_t = R₁ = R₂ = R₃
• R_t = (1/R₁ + 1/R₂ + 1/R₃