Science Unit 3 B Current Electricity

what is energy

the ability to do work. motion or the potential to create motion.

What is potential energy

Energy that needs to be turned into another form to do something

Why is electrical energy useful

We can convert the electrical energy into other forms of energy, and it's easily transported over large distances through wires.

what are the three steps to using energy

Transforming some form of energy into electricity, transporting the electricity using wires, transforming the electricity into the form we want.

What is an electrical generator

Used in generating electricity, uses magnetism to turn spinning motion into electricity.

what are fossil fuel power plants

use the chemical energy stored in coil oil or natural gas. the fuel is burned, heating water into steam, which then turns a turbine connected to a generator.

what are nuclear power plants

Like fossil fuel power plants, they also use steam to turn the turbine, but rather than burning fuel, a nuclear chain reaction releases energy stored in the nuclei of atoms, usually uranium.

how can the sun's solar energy be used

By converting it into electricity using a photovoltaic cell, or it can be used to heat liquid in a similar manner to the nuclear or fossil fuel plants.

What's a hydroelectric power plant

uses the energy stored in moving water to spin the turbine.

What’s a dc?

Dirrect current, when electrons are going only one way.wha

what’s an ac?

when the e- are switching paths

what is voltage

Do you mind of energy at school I'm of electrons is given by a power source, or the amount of energy it's cool I'm gives to a load. it's also called potential difference.

What's resistance

Measures how much the load resistor flow of electrons through it. measured in ohms.

What's current

Measure of the rate of flow of electrons. the number of electrons per second that go by a point. Measured in amperes, where one Ampere is equal to one coulomb per second.

how do you measure voltage?

voltmeter. always hooked up with one wire before and one wire after the load or battery. has to be parallel.

how do you measure current.

using an ammeter. you need to put it right in the path so all the coulombs of electrons go through it. has to be series.

what's kirchhoff's current law

at any point in the circuit, the current flowing into the point is equal to the current flowing out of the point.

what's Kirchhoff’ voltage law?

The sum of the voltage games and then he closed loop of a circuit must equal the sum of the voltage drops.

as voltages increase the current blank

increases

as the resistance is increased, the current blank.

decreases.

What is Ohm’s law?

current is equal to voltage divided by resistance i=V/R

What is V=?

V=IR

What is R=?

R=V/I

What is power?

The rate of which energy is transferred. Defined in watts, and 1 watt is 1 joule per second.

What is kWh

1 kilowatt hour is the amount of energy used in 1 hour at the rate of 1 kilowatt