electricity

electricity

Objectives

• define electric charge

• differentiate between static electricity and current electricity

• define current, voltage and resistance

• infer the relationship between current and charge

Poll

Current electricity is produced when electrons flow in a conducting loop.

• true

• false

Poll

Voltage is an energy source that causes electrons(e^-) to flow.

• true

• false

Poll

Resistors make the electrons flow faster.

• agree

• disagree

Poll

Rubbing two insulators like plastic balloon and a piece of cloth is an example of static electricity.

• yes

• no

Poll

1. Current electricity can be change by increasing or dercreasing voltage.

• agree

• disagree

• maybe

Electric charge

is produced when there is imbalanced number in electrons or protons

is this particle electrically charge?

Static Electricity

An imbalance of electric charges within or on the surface of a material.

Static electricity is named in contrast with current electricity, which flows through wires or other conductors and transmits energy.

Example of static electricity

Electric Current

An electric current is a stream of charged particles, such as electrons or ions, moving through an electrical conductor or space.

The moving particles are called charge carriers, which may be one of several types of particles, depending on the conductor.

Example of electric current

Open Ended

Differentiate static electricity from electric current.

Current

A flow of electrical charge carriers, usually electrons or electron-deficient atoms.

The common symbol for current is the uppercase letter I.

The standard unit is the ampere, symbolized by A. One ampere of current represents one coulomb of electrical charge (6.24 x 10^18 charge carriers) moving past a specific point in one second.

Voltage

Also known as electric potential difference, electric pressure or electric tension is the difference in electric potential between two points.

In the International System of Units, the derived unit for voltage (potential difference) is named volt.

In SI units, work per unit charge is expressed as joules per coulomb, where 1 volt = 1 joule (of work) per 1 coulomb (of charge).

Resistance

An electron traveling through the wires and loads of the external circuit encounters resistance. 

Resistance is the hindrance to the flow of charge. For an electron, the journey from terminal to terminal is not a direct route.

How will you determine the role of current, voltage and resistance in this diagram?

The Relation Between Current, Charge and Time

An electric current (I) is how much charge flows past a point in a unit time. Unit of current 1 amp (A) is 1 coulomb of charge passing a point in 1 second.

Imagine a highway. Charge is like the cars, current is like how many cars go past in a certain time. For example, 10 cars is like a charge, 30 cars per minute is like a current.