Definitions And Formulas

Question 1

VRIIP

Answer 1

V= E/Q
R= V/I
I= Q/T
I= P/V
P= E/T

Question 2

PE=

Answer 2

Eout/Ein × 100%

Question 3

Cost to operate=

Answer 3

P × T × cost/kwh
| |
H
Power used

Question 4

1 kV =
1 kJ =
1 ohm =
1000 mA =

Answer 4

1000 V
1000 J
1000 ohm
1 A

Question 5

SIRV

Answer 5

Series:

I=
R +
V +

Question 6

PIRV

Answer 6

Parallel:

I +
* R +
V =

Question 7

Voltage

Answer 7

The difference in potential energy per unit of charge that comes from 2 different points.

Question 8

Static Electricity

Answer 8

An imbalance of electric charge on the surface of an object

Question 9

Current electricity

Answer 9

The controlled flow of electrons through a conducting wire and is measured by the charge per unit of time.

Used to convert the energy of moving electrons into other forms of energy.

Question 10

Resistance

Answer 10

Stops the electrons from flowing through the conducting wire.

Question 11

Series: I, V
Parallel: I, V

Answer 11

Series: I= V sum
Parallel: I sum, V =

Question 12

Switch

Answer 12

Device the controls the flow of electrons by opening or closing the circuit

Question 13

Load

Answer 13

Device that converts energy into other forms of energy.

Question 14

Electric circuit

Answer 14

A continuous path in which electrons flow

Question 15

Energy source

Answer 15

Battery that provides energy to push electrons in a circuit

Question 16

Direct current

Answer 16

Flow of electrons in 1 direction through an electric circuit. Produced by an electric cell such as a battery.

Question 17

Alternating current

Answer 17

Flow of electrons that alternate in directions in an electric circuit L & R. Example a wall outlet

Question 18

Electric generating stations def

Answer 18

Converts mechanical energy into electrical energy.

Question 19

How does an electric generator work?

Answer 19

The external energy source spins a turbine consisting of a set of fan like blades. The turbine spins a coil of wires inside a magnet which produces electrical energy. Eg is in an alternating current.

Question 20

What are hydroelectric dams? Is hydroelectric dams a renewable energy source?

Answer 20

Control the flow of water so it flows past a turbine connected to a generator.

Because of the water from the waterfalls can be used over and over again, hed is a renewable energy source.

Question 21

Renewable energy source def

Answer 21

Natural energy source thats unlimited like SUN OR WIND. It can be replenished by natural processes.

Question 22

What are pros and cons of hydroelectric dams?

Answer 22

Pros: the falling water doesnt pollute air or water
Cons: create large volumes of water which can cause flooding.
To reduce the impact of flooding on the fish, they created a fish ladder that allows the fish to swim around the dam.

Question 23

Tidal energy def is it a renewable energy source?

Answer 23

The energy of moving ocean water. The movement of tides rotate a water turbine.

It’s a renewable energy source because of the movement of tides.

Question 24

Thermal generation def

Answer 24

Heating water to produce steam. The steam is used to rotate a turbine to generate electricity.

Question 25

What are ways to produce steam?

Answer 25

1. Burning fossil fuels
2. Using radioactive materials fo heat water
3. Using thermal energy deep in the earth’s crust
   Using sunlight to heat water

Question 26

What are fossil fuels def and examples

Answer 26

Coal, oil and natural gas.
Formed from plant, micro organisms that lived millions of years ago. When they die, the energy in the cells lock up and form into carbon and hydrogen. These fuels can be burned to heat water.

Question 27

Is a fossil fuel a renewable resource?

Answer 27

No it’s a non renewable resource because it takes millions of years to form and are depleted fast.

Question 28

Non renewable resource def

Answer 28

A resource that cannot be replaced as quickly as it is consumed

Question 29

Is uranium a renewable resource?

Answer 29

No its no renewable because theres a limited amount of it on earth.

Question 30

Biomass def

Answer 30

Any form of plant or animal and decaying materials. It includes wastes that can be burned as fuel

Question 31

Is biomass renewable resource?

Answer 31

Yes. Because plants grow back and animals arealways being produced.

Question 32

Thermal generation def renewable?

Answer 32

Uses thermal energy from deep in earth’s crust in the form of hot springs. Its renewable because its present in earth crust

Question 33

Coal oil natural gas and uranium are renewable t or f?

Answer 33

FALSEEEEEEEE

Question 34

Photovolatic cell def

Answer 34

Device that converts light energy from any light source directly into electrical energy.

Question 35

Friction

Answer 35

Transfer of electrons transfer of electrons between two neutral objects made from different materials that occurs when they are rubbed together or come in contact.

Question 36

Conduction

Answer 36

Two objects with different amounts of electric charge come in contact and electrons move from one object to the other. It can be neutral and charged object or two charged objects.

Question 37

Grounding

Answer 37

connecting an object to a large body that’s capable of removing an electric charge that the object might have.

Question 38

What happens when a positive charged object is grounded

Answer 38

Electrons from the ground travel up to the positively charged object until the positively charged object has become neutral

Question 39

What happens when a negatively charged object is grounded?

Answer 39

Electrons travel from the object into the ground until the object is neutral.