Series Circuits

Question 1

What is ohms law?

Answer 1

I - current equals E - Voltage over R - Resistance

I= E/R

The current in a circuit is directly proportional to the emf applied to the circuit and inversely proportional to the resistance of the circuit.

Question 2

Different variations of ohms law

Answer 2

I = E/R
E = I x R
R = E/I

Question 3

Kirchoffs voltage and current law for series

Answer 3

Et = V1 + V2 + V3
It = I1 = I2 = I3
Rt = R1 + R2 + R3

Question 4

Define Voltage

Answer 4

The potential difference in charge between two points

Question 5

What is a molecule

Answer 5

A molecule is the smallest amount of a compound that still retains all the properties of that compound. Example - H20

Question 6

Define Resistance - ohms

Answer 6

The opposition to current flow

Question 7

Define Matter

Answer 7

Matter is anything that has mass and occupies space

Question 8

What are 4 states of matter?

Answer 8

Gas, Liquids, Solids and Plasma

Question 9

What is required to change matter from one state to another?

Answer 9

Energy

Question 10

All matter is made of?

Answer 10

Atoms

Question 11

The smallest amount of an element that still retains all the properties of that element is called an…

Answer 11

Atom

Question 12

What is an electron?

Answer 12

A particle rotating in orbit around the nucleus of an atom. It has a negative electrical charge.

Question 13

What is a conductor?

Answer 13

A material having one to three valence electrons that will easily become free electrons to transmit electricity.

Question 14

What is a free electron

Answer 14

An electron that is dislodged from its atom.

Question 15

What is an insulator?

Answer 15

A material having five to eight valence electrons that prevents the normal transmission of electricity.

Question 16

What is an Ion?

Answer 16

An Atom that has gained or lost an electron.

Question 17

What is a neutron?

Answer 17

A particle in the nucleus of an atom that has no electrical charge. However it’s mass is approximately the same as a proton.

Question 18

What is a semiconductor?

Answer 18

A material having four valence electrons and is neither a good conductor or a good insulator

Question 19

What is a valence shell?

Answer 19

The outermost orbit in which electrons may revolve around the nucleus of an atom.

Question 20

What is the symbol for electrical charge and the unit of measurement?

Answer 20

The symbol is Q and the unit symbol is C for coulombs.

Question 21

What is the number of electrons for one unit of charge?

Answer 21

6.28x10 to the power of 18

Question 22

Define electric current?

Answer 22

It is the flow of electrons from a negatively charged point to a positively charged point

Question 23

What is the symbol for current and what is the unit of measurement for current?

Answer 23

The symbol for current is “i” and the unit of measurement is A for ampere.

Question 24

What is conventional current flow or “hole” flow?

Answer 24

It is the flow of electrons from a positive to a negative and is opposite to electron flow.

Question 25

What is the symbol for electromotive force and what is the unit of measurement?

Answer 25

The Symbol is “E” and the unit of measurement is “V” for volts.

Question 26

What are the 6 sources of EMF and provide an example of each?

Answer 26

1. Magnetic - alternators or generators
2. Chemical - cells and batteries
3. Friction - lightning or walking across carpet
4. Heat - thermocouples
5. Pressure - piezoelectric effect, BBQ igniters
6. Light - photovoltaic, solar cells and calculators

Question 27

What is the symbol for resistance and its unit of measurement?

Answer 27

The symbol is “R” and the unit of measurement is ohms.