Transcript 5 Electricity Show

Electricity
Complete the following notes.
Review of Energy & Power
• Energy is ability to do work
• Work is a mass moving a distance with an applied
force
• Power is the amount of work done in a given amount
of time.
• Power is or is not energy?
• What are the six forms of energy?
• What are the two types of energy?
• What are the three sources of energy?
Electricity
• Current is the flow of electrons
• Voltage is the force of electricity
• Conductors provides an easy path for
electricity to flow
• Load is the part of the circuit that changes
the energy movement into some useful form
of energy
Electricity
• Amperes (amps) is how the flow of
electrons are measured
• Direct Current (DC) is one direction of
flowing electrons
• Alternating Current (AC) is two way street
of flowing electrons
Electricity
• Resistance is an opposing force between hot
and negative
• Ohm is the measure of the resistance
• Insulator is a material that does not easily
conduct an electric current
Electricity
• How to figure out
what the amps are:
• How to figure out how
much kilowatts used:
• I = P/E
• kWh = P x h
1000
• kWh-kilowatt per hour
• P-Watts
• h-hours
• I-Amps
• P-Watts
• E-Volts
Electricity
• Lets figure amps
• 60 Watt Bulb, on 120
Volts of energy, what
is the amps?
• Lets figure amps
• 34 Watts (3 bulbs), on
120 Volts of energy,
what is the amps?
• I = 60 / 120
• I = 0.5 A (amps)
• I = (34 x 3) / 120
• I = 0.85 A
Electricity
• Kilowatt-hours
• TV, 250 Watts,
running for 1.5 hours,
what is the kWh?
• Kilowatt-hours
• Heater, 4500 Watts,
running for 1 hour,
what is the kWh?
• kWh= 250 x 1.5
1000
• kWh= 0.375
• kWh = 4500 x 1
1000
• kWh = 4.5
Electricity
• So we know how to find our Kilowatt-hour
figures now. Lets look at how much money
it would cost to run an item. Using the
heater at 4.5 kWh, it costs per hour ___?
• Cost = kWh x $0.13
• C = 4.5 x 0.13
• C = $0.56 per hour
Electricity
• Assignment:
• Take what information you have got on
electric items from your house and figure
out how many amps your house needs.
• Then figure out how many kilowatt-hours
you demand plus how much it costs to run
these items per hour.
• On Monday, March 5, we will discuss this
plus you will have a test over these notes.