Calculating Electrical 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 resistor is a device that controls the flow of current in electric circuits.

• True
• False

An electric current is a flow of charged particles.

• True
• False

Tags

NGSS.HS-PS2-5

In alternating current, the motion of the charges:

• continuously changes in the forward and reverse directions.
• is equal to the speed of light.
• is greater than the speed of light.
• is in the same direction of the electric field.

Tags

NGSS.HS-PS2-5

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

Three resistors connected in series carry currents labeled I₁, I₂ and I₃ respectively.
 
Which of the following expresses the total current, I_t, in the system made up of the three resistors in series?

• I_t =I ₁ + I₂ + I₃
• I_t = (1I₁ + 1/I₂ + 1/I₃)
• I_t = I₁ = I₂ = I₃
• I_t =1/(1/I₁ + 1/I₂ + 1/I₃)

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)

Three resistors with values of 4.0 Ω, 6.0 Ω and 10.0 Ω are connected in parallel. What is their equivalent resistance?

• 20.0 Ω
• 7.3 Ω
• 6.0 Ω
• 1.9 Ω

Tags

NGSS.HS-PS2-5

The rate at which electric energy is transferred is:

• power
• voltage
• resistance
• current

Tags

NGSS.HS-PS3-5