Unit 2, 3,4 and 5

Question 1

Define a Coulomb:

Answer 1

One Coulomb is a certain amount of electrons. A coulomb is defined as the charged transferred by a current of 1 ampere in one second

Question 2

Define the Ampere:

Answer 2

The Ampere is defined as the amount of Coulombs per second.

Question 3

State the 4 types of basic circuits and the definition of each:

Answer 3

1. Open circuit (no flow)
2. Closed. circuit (Flow)
3. Short circuit (When the current bypassed the load, resulting in overcurrent)
   4.Grounded circuit (Provides a low resistance path to ground, no current flow through ground unless a circuit fault occurs. It’s only the hot and neutral which carry current)

Question 4

Define a volt:

Answer 4

A volt is the current potential between two points. It requires 1 volt to push 1 ampere through 1 ohm of resistance

Question 5

Explain watts:

Answer 5

Watts is the amount of power or work extracted by the combination of Volts and Amperes. 120 V x 1amps = 120 watts

Question 6

Ohm law =

Answer 6

Current (volts) = Amperes x Ohms (E = I x R) To find the correct values, draw a cricle with E in the top half. Divide the circle in two with ‘I’ and ‘R’ in the bottom half. Cover the wanted letter.

R = Current (amps)

I = Resistance (ohms)

E = Volts

Question 7

Explain the basic purpose of a resistor:

Answer 7

To regulate the amount of amperes in a circuit. Ohms law: volts = resistance x amperes.

If this resistor were not present, the circuit current would be limited only by the resistance of the conductor, which would be very low, and a large amount of current would flow. Assume, for example, that the wire has a resistance of 0.0001 ohm. When the wire is connected across the 15-volt power source, a current of 150,000 amperes would try to flow through the circuit (15 V/0.0001 V 5 150,000 A).