Module 2- Engineered Pro...ducks?

Question 1

What is OHM’s law

Answer 1

V=IR
v = Voltage
I = Current
R = Resistance

Question 2

Conductor

Answer 2

Transfers energy well

Question 3

Insulator

Answer 3

blocks energy well

Question 4

How to calculate series circuits resistance

Answer 4

Rt = R1+ R2 +R3

Question 5

How to calculate parallel circuits resistance

Answer 5

1/Rt = 1/R1+ 1/R2 +1/R3

Question 6

How to calculate series parallel circuits resistance

Answer 6

Rt = 1/R1+ 1/(R2 +R3)
Parallel circuit with one series at R2-R3

Question 7

How to calculate a circuits components

Answer 7

1. total resistance
2. total voltage = ohms law
3. apply current throughout (except for parallel where current is shared but not voltage)
4. ohms law to find currents and volts

Question 8

Why are there variations between calculations and measured values?

Answer 8

When dealing with circuits there can be methodological assumptions, error margins, and the complexity of interrelated components in the measurement process which diminish the accuracy of the measured values.

Question 10

Potential difference (E)

Answer 10

Electromotive force, a pressure that forces electrons through a system.
Units = volts (V)

Question 11

Resistance (R)

Answer 11

R = P * l/a
R = resistance exhibited to flow
P = resistivity
l = length (m)
a = cross sectional area (m^2)

Question 12

Conductivity

Answer 12

reciprocal of resistivity which varies with temp

Question 13

Switches

Answer 13

polarity: no
Extremely important for most appliances, switches allow the operator to control the flow of electricity in the appliance.

Question 14

Cell

Answer 14

polarity: yes
This is a device used to produce electricity. It may be a chemical reaction that produces the electricity.

Question 15

Battery

Answer 15

polarity: Yes
A group of cells connected together is called a battery. An example is a 9 volt battery, which has 6 cells linked together.

Question 16

Resistor

Answer 16

polarity: no
An electronic device that provides resistance to a circuit. Resistors merely limit the flow of electrons.

Question 17

Potentiometer

Answer 17

polarity: yes
A variable resistor; by sliding or rotating a controller the resistance may be increased or decreased.

Question 18

Capacitor

Answer 18

polarity: no
The capacitor is a device capable of storing an electric charge, however unlike a battery it does not produce the charge and cannot hold it indefinitely.

Question 19

Electrolytic capacitor

Answer 19

polarity: yes
An electrolytic capacitor is a special capacitor that has polarity, which allows it to have higher values without larger case sizes.

Question 20

Diode

Answer 20

polarity: yes
A diode only allows current to flow in one direction. Often used to protect components from current flowing the wrong way

Question 21

Light emitting Diode

Answer 21

polarity: yes
A diode that emits light; these are used as indicators where the unreliability of a bulb is undesirable.

Question 22

Transistor

Answer 22

polarity: yes
This revolutionary component acts like a switch or amplifier. Essentially it is the basis of many electronically controlled devices.

Question 23

Motor

Answer 23

polarity: yes/no
These are described further on. They convert electricity into rotary motion.

Question 24

Loudspeaker

Answer 24

polarity: no
Often used to emit warning sounds on appliances, and in recreational devices.

Question 25

Circuits

Answer 25

A complete path in which electric currents flow through a loop. It has components which can reduce, amplify or transform electricity as well as different loop structure like parallel and series.