What you need: NotebookNotebook CalculatorCalculator Writing utensilWriting utensil.

Slides:



Advertisements
Similar presentations
Mrs. Cockrell PAP Physics
Advertisements

Circuits & Circuit Diagrams
Factors Affecting Resistance
Unit 4 – Electricity & Magnetism
 With a partner, get a battery, light bulb, and paper clip.  Find the two ways to light up the light bulb using just these three items.  Draw pictures.
…the movement of charge between varying locations and the corresponding loss and gain of energy which accompanies this movement. Unit 4 - Electric Circuits…
Quarter 3 Test 2 Review. 1 Typically, household appliances operate at 120 volts. What is the current flowing in the circuit of a microwave when the resistance.
Science 9 Electricity Review Ohm’s Law Circuits.
8. Power in electric circuits
II. Electric current 1. Definition Units: [ I ] = 1A = 1 C/s Conventional current Electron flow Example: electrons passed through the electric conductor.
22-1 Current & Circuits. Potential Difference Charges can “lose” potential energy by moving from a location at high potential (voltage) to a location.
Power and Electricity Cost Physics. Electric Power The proportional rate of the amount of current being sent through a circuit to the amount of voltage.
Energy Review. The unit for kinetic energy. Joule.
Electric Power, AC, and DC Electricity
19-3: Electric Power Objectives:
Electricity Current Electricity.
Circuits & Electronics
Circuits. Reviewing terms Series and Parallel Circuits Key Question: How do series and parallel circuits work?
Circuits Electric Circuit: a closed path along which charged particles move Electric Current: the rate at which a charge passes a given point in a circuit.
Current Electricity. Producing Current Current: Flow of charged particles Cell: Source of conversion of chemicals into electric energy. Types of Cells:
Electrical Power and Energy. When a battery sends a current through a resistor, as in Fig. the battery is furnishing energy to resistor. In effect, the.
Electricity.
Four identical resistors, P, Q, R and S are connected as shown. In which of the resistors is the current the same? 1.P and Q only 2.R and S only 3.P, R.
Current Electricity. Electrons P n nucleus e- Flow of Electrons (Path) e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- - + Electrons Flow Conventional Current.
Ch 8-9 Review. What is the current flowing through this circuit? 3 A.
=Ohms_Law Voltage (Volts) Current (Amps) Resistance (Ohms or Ω)
Ohm’s Law & Electrical Power. Resistance - the tendency for a material to oppose the flow of electronsResistance - the tendency for a material to oppose.
Electrical Power Chapter 19 Section 3. Energy to Power Electrical Power is the rate of conversion of electrical energy. Electrical Power is the rate of.
Chapter 22 Current Electricity Milbank High School.
4.2.3B Electrical Power What About Watts?. Power Law Moving electrons (current) requires ENERGY How much energy gets used depends on: Strength of push.
Kashif Bashir1 mailto: Web: kashifpaf.greatnow.comkashifpaf.greatnow.com OHM’s LAW.
Electric Current and Ohms Law. Electric Current The continuous flow of electric charge –The two types of current are direct current (DC) and alternating.
The SI unit of electric potential; symbol is V
Circuits with more than one resistor, then Watt happens? Series and Parallel are the 2 ways of connecting multiple resistors.
SPH3U Electricity & Circuits
Chapter 22 Current Electricity.
8. Power in electric circuits R V I. Example: Two resistors, R 1 = 5 , R 2 = 10 , are connected in series. The battery has voltage of V = 12 V. a) Find.
Electric Circuits. Potential Electric Potential is just like gravitational potential It depends on –The distance from the source –The amount of charge.
Chapter 6 Power. Chapter 6.1 Power in Mechanical Systems.
Electrical energy The rate at which electrical energy is moved through a circuit is given in terms of power. The unit for electric power is the Watt (W)
Physical Science Mr. Barry. Series circuits have one loop through which current can flow.
Electric Current. Ohm’s Law
Power. Energy Transformation Electric energy can be transformed into other more useful forms Power is the rate of energy transformation P = ΔPE/t ΔPE.
Parallel Circuit A parallel circuit is one that has two or more paths for the electricity to flow – similar to a fork in a river A parallel circuit is.
Current Electricity. Section 22.1 Objectives Describe conditions that create current in an electric circuit. Use Ohm’s law to calculate properties of.
Current Electricity Current and Circuits Producing Electricity: electric current conventional current battery photovoltaic.
22.1 Current and Circuits. Producing Electric Current When 2 conducting spheres touch, charges flow from the sphere at a higher potential difference to.
 Circuit = Complete path where electrons can flow  Circuit diagram symbols:  Wire/Conductor  Resistor (light bulbs, fans)  Battery  Switch.
Hosted by Mr. McDevitt Voltage CurrentPower Short Circuit
Electric Current. Charge in motion (“flow” of charges). Charge in motion (“flow” of charges). Current: The number of electrons that pass a specific point.
The flow of charged particles charged particles ; through a conducting metal.
Power in Electrical Systems Power in Electrical Systems.
Chapter 6.3 Notes Electrical Power. Voltage causes charges to move in circuits. This movement creates work. How fast the charge does work is called Power.
Chapter 34 Notes Electric Circuits. Electric Current Intro Voltage is an “electric pressure” That can produce a flow of charge, or current, within a conductor.
Circuits. Reviewing terms Circuits need 3 basic parts: An Energy Source Load (Power demand) Wires.
WARM UP Draw a picture of a SERIES Circuit. Show a battery, a switch, and a light bulb in your drawing. Draw a picture of a PARALLEL Circuit. Show a battery,
Current.
through a conducting metal
Electric Power Energy Cost
A battery raises the potential energy of a charge by an amount equal to qΔV. ΔV is the potential difference of the battery.
Electrical Energy and Power 17.8
Science 9 Electricity Review.
Basic Electrical Calculations
Modified by Mr. Wanninkhof
CIRCUITS Current Resistance Ohms Law Power Series Circuits
Please bring your book tomorrow.
Electric Power.
Announcement Ohm’s law video is due at midnight Makeup lab today
20.1 Short circuit A short circuit is a parallel path in a circuit with zero or very low resistance. Short circuits can be made accidentally by connecting.
Hosted by Mrs. McDevitt 
Presentation transcript:

What you need: NotebookNotebook CalculatorCalculator Writing utensilWriting utensil

Ohm’s Law, Power, & Energy

Currents and Circuits Current - the flow of charged particlesCurrent - the flow of charged particles Circuit - a closed continuous path through which current flowsCircuit - a closed continuous path through which current flows - requires a voltage source to maintain the potential difference - requires a voltage source to maintain the potential difference

Ohm’s Law Resistance = Voltage/ CurrentResistance = Voltage/ Current R = V / IR = V / I UnitsUnits –Resistance (R) = ohms (Ω) –Voltage (V) = volt (V) –Current (I) = ampere (A)

Ohm’s Law Increasing voltage increases resistanceIncreasing voltage increases resistance Increasing current decreases the resistanceIncreasing current decreases the resistance

Resistors Any device that changes electrical energy into another formAny device that changes electrical energy into another form

Example #1: A 30.0 V battery is connected to a 10.0 Ω resistor. What is the current in the circuit?A 30.0 V battery is connected to a 10.0 Ω resistor. What is the current in the circuit? I = V/RI = V/R I = 30.0 V / 10.0 ΩI = 30.0 V / 10.0 Ω = 3.00 A= 3.00 A

Power Measures the rate at which energy is transferredMeasures the rate at which energy is transferred Power = Current x VoltagePower = Current x Voltage P = IVP = IV The unit of power is the WattThe unit of power is the Watt

Example #2: A 6.0 V battery delivers a 0.50 A current to an electrical motor. What power is consumed by the motor?A 6.0 V battery delivers a 0.50 A current to an electrical motor. What power is consumed by the motor? P = IVP = IV P = (0.50 A)(6.0 V)P = (0.50 A)(6.0 V) P = 3.0 WP = 3.0 W

Electrical Energy Energy = Power x timeEnergy = Power x time E = PtE = Pt If you are using Watts, use seconds for time. In this case, energy is measured in Joules.If you are using Watts, use seconds for time. In this case, energy is measured in Joules.

Continue Example #2: Using the information from the Example #2, how much electric energy is delivered if the motor runs for 5.0 minutes?Using the information from the Example #2, how much electric energy is delivered if the motor runs for 5.0 minutes? E = PtE = Pt E = (3.0 W)(300 s)E = (3.0 W)(300 s) E = 9.0 x 10 2 JE = 9.0 x 10 2 J

The Kilowatt-Hour The joule (a “watt-second”) is a relatively small amount of energy; too small for commercial sales use.The joule (a “watt-second”) is a relatively small amount of energy; too small for commercial sales use. For that reason, electric companies measure their energy sales in “kilowatt-hours”.For that reason, electric companies measure their energy sales in “kilowatt-hours”.

The Kilowatt-Hour A kilowatt-hour is equal to 1000 watts delivered continuously for 3600 seconds (1 hour).A kilowatt-hour is equal to 1000 watts delivered continuously for 3600 seconds (1 hour). 1 kWh = (1000 J/s)(3600 s) = 3.6x10 6 J

Example #3: A plasma tv draws 2 A when operated on 120 V.A plasma tv draws 2 A when operated on 120 V. –How much power does the tv use? –If the tv is operated for an average of 7 hr/day, what energy in kWh does it consume per month (30 days)? –At 11¢ per kWh, what is the cost of operating the tv per month?