Midterm

Question 1

The current, voltage, power, and resistance in a series circuit can be found by using ___ law

Answer 1

Ohm’s

Question 2

When a circuit has only one path, the____ is the same at any point

Answer 2

Current

Question 3

A(n) _____ ground symbol is used to symbolize a ground point made by physically driving an objest such as a rod or pipe into the ground

Answer 3

Earth

Question 4

A circuit that has only one path for current flow

Answer 4

Series

Question 5

Wire wound resistors are often used because they can

Answer 5

Operate at high power levels than other resistors

Question 6

Point that is used as a common connection for other parts of a circuit is called a

Answer 6

Chasis point

Question 7

A resistor made by applying a film of carbon to a ceramic rod is

Answer 7

A carbom film resistor

Question 8

What does the fourth band of a color on a 5 band resistor indicate?

Answer 8

Tolerance

Question 9

A device that is designed to open and disconnect a circuit in the event of excessive current is a

Answer 9

Fuse

Question 10

A variable resistor with 3 terminals is called a

Answer 10

Potentiometer

Question 11

2 resistors in a series circuit have voltages of 25 and 60 volts, what is the applied voltage?

Answer 11

85v

Question 12

A series corcuit has a total resistance of 240 ohms and a current flow of 4 amps, what is the applied voltage?

Answer 12

R x I, 240 x 4=960 v

Question 13

Resistor that is made by winding a piece of resistive wire around a ceramic core

Answer 13

Wire wound resistor

Question 14

The force that pushed the electrons through resistance

Answer 14

Voltage

Question 15

A series circuit has a total resistance of 180 ohms and applied voltage is 120 v. What is the current flow?

Answer 15

I/R, 120/180=0.6667

Question 16

The resistor circuit has a total power of 25 W. two of the resistors dissipate 10 w and 5 w. How much power does the 3rd resistor dissipate?

Answer 16

R3= Rt-R1-R2, 25-10-5=10

Question 17

What are the rules for a parallel circuit?

Answer 17

1) total current flow is equal to the sum of currents through all branches
2) voltage drop across any branch is equal to the source voltage
3) total resistance is always less than the resistance of the lowest value of resistor in the branch

Question 18

What are series circuit rules

Answer 18

1) current is the same at any point in the circuit
2) total resistance is the sum of individual resistors
3) applied voltage is equal to the sum of voltage drops across all resistors

Question 19

How many valence electrons do insulators have?

Answer 19

7-8

Question 20

What are semiconductors?

Answer 20

Materials that are neither good nor bad conductors

Question 21

How many valence electrons are in semiconductors?

Answer 21

4

Question 22

What are 6 basic methods if producing electricity

Answer 22

Magnetism
Chemical action
Pressure
Heat
Friction
Light

Question 23

What are 5 basic electrical effects

Answer 23

Magnetism
Chemical reactions
Pressure
Heat
Light

Question 24

What are conductors?

Answer 24

Materials that provide an easy path for electron flow

Question 25

How many valence electrons in conductors?

Answer 25

1-3

Question 26

What is voltage?

Answer 26

Potential difference between 2 points of conducting wire

Question 27

What is a volt

Answer 27

Amount of potential necessary to cause 1 coulomb to produce 1 joule of work

Question 28

What is an ohm

Answer 28

Unit of resistance to current flow

Question 29

What is a watt

Answer 29

Amount of power being used in a circuit