310203aA/B Electrical Theory - Part A/B

Question 1

Describe the acronym for the resistor colour code chart

Answer 1

Black
Beer
Rots
Our
Young
Guts
But
Vodka
Goes
Well

Question 2

What is the resistance value of a resistor stamped 2R2?

Answer 2

2.2 Ohms

Question 3

What is the resistance value of a resistor stamped 2K2?

Answer 3

2.2 kilo-ohms or 2200 ohms

Question 4

What is the resistance value of a resistor stamped 2M2?

Answer 4

2.2 mega-ohms or 2,200,000 ohms

Question 5

Describe ohm’s law

Answer 5

Current is directly proportional to voltage and is inversely proportional to resistance
I = E/R

Question 6

Describe the 2 ways that Kirchoff’s voltage law can be expressed

Answer 6

1. The voltage rises in a circuit are equal to the voltage drops.In that circuit
2. The algebraic sum of the voltages in a closed-loop equals 0

Question 7

How many watts are in one horsepower

Answer 7

1hp = 746 W

Question 8

How many electrical degrees are in one complete cycle?

Answer 8

360°

Question 9

Define a cycle, in electrical terms

Answer 9

A cycle in electrical terms describes currents or voltages that are not constant, but very through one complete set of values that repeat at a fixed rate
A cycle is typically from the time that the voltage crosses 0V moving in the positive direction until the next time the voltage is 0V moving in the positive direction

Question 10

Define what a period is in electrical terms and the formula for it

Answer 10

The period (T) is the amount of time one cycle (360°) requires in seconds

Time (seconds) = 1 ÷ frequency (hertz)

Question 11

Define Power

Answer 11

Power is the rate of doing work

Question 13

What is the voltage across a capacitor when the current is at its maximum value?

Answer 13

The voltage across a capacitor when current is at its maximum is 0V

Question 14

How many time constants does it take for a capacitor to fully charge?

Answer 14

Five time constants

Question 15

What is the formula used for finding the time constant of a series circuit?

Answer 15

Question 16

What happens to the capacitance of a capacitor is you increase the distance between its plates?

Answer 16

The capacitance decreases

Question 17

What happens to the capacitance of a capacitor if you decrease the distance between its plates?

Answer 17

Capacitance increases

Question 18

Connecting capacitors in series has what effect on total capacitance?

Answer 18

Total capacitance decreases

Question 20

Capacitors oppose a change in _______

Answer 20

Capacitors oppose a change in voltage

Question 21

How do you calculate the voltage drop across a capacitor?

Answer 21

Question 22

What effect does adding capacitors in parallel have on total capacitance?

Answer 22

Total capacitance increases

Question 23

Inductors and inductive reactance oppose a change in ______

Answer 23

Inductors and inductive reactance oppose a change in current