advertisement

advertisement

Information about 8-2 Electric Current

advertisement

8-2 Current Electricity
Describe electric current.
Identify the two types of current.
Explain how voltage produces electric current.
Calculate voltage, current, and resistance using Ohm’s Law

Electric Current
A steady flow of electrons through a conductor.
Measured in amperes or amps (A).
Variable is “I”

Direct Current (DC)
Charge flows in one direction.
battery operated devices
Electrons flow from the negative to the positive.
Opposite to direction of the current.

Alternating Current (AC)
A flow of electrical charge that regularly reverses the flow of charge.
American electricity changes directions 60 times a second.
Household current is alternating current.

Potential Difference
Also known as Voltage.
The “push” that causes electrons to flow through a circuit.
Measured in volts (V).
Variable is “V”

Resistance
Anything that slows the flow of electrons through a conductor.
Measured in ohms (W ).
Variable is “R”

Ohm’s Law
The mathematical equation that shows the relationship between current, potential difference and resistance.
V = IR
Where: I = current in amps (A)
V = potential difference in volts (V)
R = resistance in ohms (W)

Sample Problem
How many 1.5V batteries would be needed to supply 0.83A of current if the appliance offers 5.4W of resistance?
I = 0.83A
R = 5.4W
V = IR
V = 0.83A(5.4W)
V = 4.482V
4.482V / 1.5V per battery = 2.988 or 3 batteries

Sample Problem
If a lamp bulb requires 5.5amps of current supplied at 110volts, how much resistance does it offer?
I = 5.5amps
V = 110volts
R = V / I
R = 110V / 5.5a
R = 20W

Sample Problem
If an electrical appliance offers 24W of resistance, and is connected to a 9.0V battery, how much current will flow?
R = 24W
V = 9.0V
I = V / R
I = 9.0V / 24W
I = 0.375a

Conclusion
What is the relationship between current, voltage, and resistance?

Presentación que realice en el Evento Nacional de Gobierno Abierto, realizado los ...

In this presentation we will describe our experience developing with a highly dyna...

Presentation to the LITA Forum 7th November 2014 Albuquerque, NM

Un recorrido por los cambios que nos generará el wearabletech en el futuro

Um paralelo entre as novidades & mercado em Wearable Computing e Tecnologias Assis...

Microsoft finally joins the smartwatch and fitness tracker game by introducing the...

Characteristics of Electricity - Section 8.2 Quiz. ... What unit is used to measured electric current? ? Amperes ? Volts ? Newtons ? Ohms Which ...

Read more

Current electricity is the flow of charged particles in a complete circuit.The unit for measuring electric current is the ampere (A), which is defined as ...

Read more

1. Warm-up Which particles move freely through metals? Atoms c. Protons Electrons d. Molecules What is the charge on the following particles: Proton-

Read more

116 MHR • Section 8.2 Electric Current © 2007 McGraw-Hill Ryerson Limited Name Date Section 8.2 Electric Current Summary Textbook pages 280–289 Before ...

Read more

Study online flashcards and notes for 8.2 Electric Current including amperes: unit for measuring electric current; very small currents are measured in ...

Read more

8.2 Electric Current Name: Date: Block: (Reference: BC Science 9 pp. 280 - 289) Electric Circuits electric circuit: ...

Read more

Vocabulary words for 8.2 Electric Current. Includes studying games and tools such as flashcards.

Read more

8.2 Electric CurrentName: Date: Block: ... the electron’s electric potential energy is transformed into another form(s) ... CURRENT ELECTRICITY AND ...

Read more

Section 8.2 Electric Current Before You Read 1. Words to Know ... E. the unit of electric current ____ electric load F. the amount of charge passing a

Read more

## Add a comment