Science 2

is essential for lighting, powering appliances, transport and communication systems.

Electricity

is the flow of charged particles. Charged particles include positive protons and negative electrons.

Electricity

is the flow of electrons around a circuit.

Electric Current

A closed conducting path where charges flow. there are three essential elements in an electric current, resistance and voltage or potential differences.

Electric Circuit

is the amount of charge passing through any point in a conductor per unit time.

Electric

Unit of Current

A (Ampere)

The current produced due to the flow of positively charged particles is called?

Conventional Current

The flow of negatively charged particles also known as electrons is called?

Electron Current

Is a current that flows in one direction at all time

Direct Current

Is a current that charges direction at regular intervals.

Alternating Current

Examples of Direct Current

Flashlights, Calculators, Cellphones

is the opposite to the flow of electricity.

Resistance

Unit of Resistance

Ohm

Unit Ohm is named after?

Georg Simon Ohm

are used to control or limit the amount of current in an electric circuit.

Resistors

What are the two sets of symbols are used to represent resistors

IEC and ANSI

What is IEC?

International Electrotecnical Comission

What is ANSI

American National Standards Institute

4 Factors affecting Resistance of a uniform wire

Cross-Sectional Area, Length, Kind of Material, Temperature

Is the energy per unit charge needed to move a charge from one point to another.

Voltage or Potential Difference

In an electric circuit, this energy per unit charge is usually called?

Voltage

In cicuit diagram, the longer vertical line is the?

Positive Terminal

In cicuit diagram, the shorter vertical line is the

Negative Terminal

consists of one positive electrode and one negative electrode.

Electric Cell

These electrodes are immersed in an ion-conducting meduim called?

Electrolyte

use to paste - like or gel electrolyte, making them more convenient to use in portable devices.

Dry Cell

contain a liquid electrolyte, which is usually found in automotive batteries.

Wet Cell

He invented the first electric cell in 1799.

Alessandro Volta

When did Alessandro Volta invented the first electric cell?

1799

It consisted of alternating dics made of zinc and copper (or other metal such as silver) with a piece of cloth soaked in salt solution between them. This cell called?

Voltaic Pile

Dry Cells are usually in?

Toys, Alarm Clocks, Flashlight

Are use in cars

Storage b

are typically use in electron and in cellular phone.

Lithium Ion Batterr

They emit electrons when they are struck by light.

Solar Cell

The first solar battery consisted of several strip of silicon and was developed in?

1954

Who developed the e first solar battery consisted of several strip of silicon?

Gerald Pearson, Calvin Fuller, Daryl Chapin

that cannot be recharged are called?

Primary Cells

cells that are rechargeable are?

Secondary Cells

is the maximum potential difference generated by a source, such as a battery or generator, when no current is drawn from it.

Electromotive Force

It represents the energy supplied per unit charge to move electrons through the circuit and is independent of the external load or circuit resistance.

Electromotive Force

is measured in volts and is constant for a given source under open-circuit conditions

Electromotive Force

is the actual voltage measured across the terminals of a source when it is connected to a circuit and current is flowing.

Terminal Voltage

It accounts for the voltage drop across the internal resistance of the source, making it always less than or equal to the EMF

Cells also offer a small resistance to electric current, called the?

Internal Resistance

Internal Resistance is represented by?

r

The potential difference across its terminals when no current is flowing is called?

Electromotive Force

Electromotive Force is represented by?

E

The current voltage, resistance in an electric circuit are measured using an?

Ammeter, Voltmeter, Ohmmeter

These three instruments are combined form a single device called? which can be switched from one measurement mode to another.

Multimeter

is a circuit elements that either allows current to flow or stop it.

is just connected actross the circuit elements (in this case , the resistor). with a positive probe connected to the positive side of the elements and the negative probe to the negative side.

Voltmeter

is connected to a circuit element whose resistance is to be measured. similar to how voltmeter is connected.

Ohmmeter

has componenets connected one after another along a single path.

Series Circuit

has components connected side by side, creating multiple paths for current.

Parallel Circuit

is acombination of two or more cell. Cells may be connected in series or in parallel. cells are in series when the positive terminal of one cell is connected to the negative terminal in the next cell

Battery

involves practices, equipment, and regulations designed to prevent accidents, injuries, and fatalities caused by electricity.

Electrical Safety

is essential to protect people, property, and equipment from hazards such as electric shock, burns, fires, and explosions

Electrical Safety

is a large switch that an electromagnetic open automatically when the current in the circuit gets to large.

Circuit Breaker

Most electrical appliciance are equipped with three-pronged plug in their power cords. The two principle flat wires, called "_____ "and "______ ", allows electricity to flow through the appliance and power it. the Third prong, called the "earth pin" is a safety features.

live or neutral