RL Parallel Circuits

Question 1

The total inductance of a parallel circuit is always _____ than the smallest inductor.

(more or less)

Answer 1

The total inductance of a parallel circuit is always less than the smallest inductor.

Question 2

To find total inductance (Lt) in a parallel circuit, what formula is used?

Answer 2

Question 3

INDUCTANCE - The _____ the inductance, the larger the magnetic field. A larger magnetic field causes ______opposition to current. Since inductive reactance is the opposition to current, inductive reactance increases when inductance______.

Answer 3

INDUCTANCE - The greater the inductance, the larger the magnetic field. A larger magnetic field causes more opposition to current. Since inductive reactance is the opposition to current, inductive reactance increases when inductance increases.

Question 4

FREQUENCY - The ____the frequency, the faster the magnetic field expands and contracts. More movement from the magnetic field produces _____ opposition to current. Since inductive reactance is the opposition to current, inductive reactance _______ when frequency increases.

Answer 4

FREQUENCY - The higher the frequency, the faster the magnetic field expands and contracts. More movement from the magnetic field produces greater opposition to current. Since inductive reactance is the opposition to current, inductive reactance increases when frequency increases.

Question 5

XL is measured in ohms and is dependent on the value of ____ and the _____ of the circuit.

Answer 5

XL (inductive reactance) is measured in ohms and is dependent on the value of **inductance **and the frequency of the circuit.

Question 6

What is the formula for XL?

Answer 6

XL = 2pfL

XL = inductive reactance ohms (W)

p = 3.14

f = frequency in hertz (Hz)

L = inductance in henries (H)

Question 7

What formula is used to find total inductive reactance (XLt)?

Answer 7

Question 8

The combined opposition to current flow from the resistor and inductor is called _______ (Z). The unit of measure is ______.

Answer 8

The combined opposition to current flow from the resistor and inductor is called impedance (Z). The unit of measure is ohms.

Question 9

In a parallel circuit, what is the formula for total impedance (Zt)?

Answer 9

Question 10

What is the difference in formulas for finding Zt in series and parallel circuits.

Answer 10