Quiz 6 Flashcards
Understanding and Calculating Resistance in DC Circuits
The resistance of the connecting wires in a series circuit is generally ? the resistance of the load.
a. equal to
b. greater than
c. less than
d. significantly greater than
c. less than
The formula for determining the total series resistance in a circuit is
Rₜ = R₁ + R₂ + R₃ + ….Rₙ
True or False?
True.
When resistors are connected in series, their values are ? to find the total circuit resistance.
a. added
b. divided
c. multiplied
d. subtracted
Note: Rₜ = Total Circuit Resistance
R₁ = 1st Resistor (in ohms)
R₂ = 2nd Resistor (in ohms)
R₃= 3rd Resistor (in ohms)
Rₙ = Nth Resistor (in ohms)
a. added
A lamp connected in series with other components in an electric circuit will not contribute to the total resistance of the circuit.
True or False?
False
Note: A lamp connected in series with other components in an electric circuit will contribute to the total resistance of the circuit.
In a series circuit, decreasing the size of the circuit conductor would ? the total resistance of the circuit.
a. decrease
b. increase
c. not have any impact on
d. significantly decrease
b. increase
A switch is connected in a series circuit. If the contacts on the switch are opened, the resistance of the circuit (including the switch) will ?.
a. decrease
b. increase (to infinity)
c. not change
d. significantly increase
b. increase (to infinity)
Using Ohm’s Law, what is the equation for total resistance when the total voltage and total current are known?
a. Rₜ = Iₜ + Eₜ + Cₜ
b. Rₜ = Iₜ × Eₜ
c. Rₑ = Iₜ / Eₜ
d. Rₜ = Eₜ / Iₜ
d. Rₜ = Eₜ / Iₜ
Calculate the total resistance of the circuit.
(Insert image of circuit with 12 V load and R₁ = 10 Ω, R₂ = 16 Ω, R₃ = 8 Ω, and R₄ = Ω)
45 ohms
Solve for the total resistance in the circuit.
(Insert image of circuit with R₁ = 2 kΩ and R₂ = 1000 Ω)
3000 Ω
Solve for the total resistance in the circuit.
(Insert image of circuit with R₁ = 120 Ω, R₂ = 10 Ω, R₃ = 75 Ω, and R₄ = 30 Ω)
235 Ω
The purpose of the “O Ω Adjust” knob on an analog meter is to allow the meter to be adjusted to compensate for test lead resistance and battery voltage level when making resistance measurements.
True or False?
True.
It is not necessary to disconnect the power from the circuit before taking resistance measurements.
True or False?
False.
Failure to remove power from the circuit could damage the meter and could cause harm or personal injury to the individual performing the test.
If the total resistance of the circuit is 100 Ω, what is the value of R1?
(Insert image of circuit with 500 V load, and R₁ = x Ω, R₂ = 10 Ω, R₃ = 40 Ω, and R₄ = 20 Ω)
30 Ω
Rₜ = R₁ +R₂ + R₃ + R₄
R₁ = Rₜ - (R₂ + R₃ + R₄)
= 100 - (10 + 40 + 20)
= 30 Ω
If the values of R2 and R3 in the circuit are equal and the total resistance is 50 Ω, what is the individual resistance value of R2 and R3?
Eₜ = 500 V
R₁ = 15 Ω
R₂ = x Ω
R₃ = x Ω
R₄ = 5 Ω
Rₜ = 50 Ω
15 Ω
If the values of R2 and R3 in the circuit are equal and the total resistance is 50 Ω, what is the individual resistance value of R2 and R3?
R₂, ₃ = Rₜ - ( R₁ + R₄)
= 50 - (15 + 5)
= 30 Ω
R₂ = R₂, ₃ / 2
= 30 / 2
=15
R₃ = R₂, ₃ / 2
= 30 / 2
Solve for the resistance of resistor R1 in the circuit.
E = 220 V
R₁ = x Ω
I = 5 A
44 Ω
R = E / I
= 220 / 5
= 44 Ω
Solve for the total resistance in the circuit.
Eₜ = 10 V
R₁ = x Ω
R₂ = x Ω
Iₜ = 1/8 A
80 Ω
Rₜ = E / I
= 10 / ⅛
= 80 Ω
If the value of R1 in the circuit is 33 Ω and the total resistance is 80 Ω, then what is the value of R2?
Eₜ = 10 V
Rₜ = 80 Ω
R₁ = 33 Ω
R₂ = x Ω
Iₜ = 1/8 A
47 Ω
R₂ = Rₜ - R₁
= 80 - 33
= 47 Ω
Solve for the resistance of L1 in the circuit.
Eₜ = 12 V
Rₜ = x Ω
R₁ = 10 Ω
Rᴸ₁ = x Ω
Rᴸ₂ = x Ω
Iₜ = 0.2 A
25 Ω
Rₜ = E / I
=12 / 0.2
= 60 Ω
Rᴸ₁ + Rᴸ₂ = Rₜ - R₁
= 60 - 10
= 50 Ω
Rᴸ₁ = (Rᴸ₁ + Rᴸ₂) / 2
= 50 / 2
= 25 Ω
Rᴸ₂ = (Rᴸ₁ + Rᴸ₂) / 2
= 50 / 2
= 25 Ω
