Electricity in the home Chapter 52 Fuses A fuse is a safety device which cuts off the current in a circuit if the current goes above a certain level.

Slides:

Advertisements

Similar presentations

Topic 7: Electricity in the Home Science 9 with Mrs. M Please take off your hoods and hats Bring a calculator to class next week.

Advertisements

What is included in a circuit diagram?

Electrical Energy Chapter 13 Section 3.

S Explain parallel circuits, components, and safety of house wiring. S Develop a formula for power consumption and solve related problems.

ELECTRICAL SYSTEMS 21.3.

Chapter : 7 : Mains Electricity

20.3 Electric Circuits Key Concepts What is included in a circuit diagram? How do series and parallel circuits differ? How do you calculate electrical.

The Fuse Box The circuits in our homes are connected in parallel.

Series Circuits One kind of circuit is called a series circuit. In a series circuit, the current has only one loop to flow through. 7.3 Electrical Energy.

Electric Circuits Chapter 20.3.

 Rate at which energy is consumed or produced  Changed into other forms of energy  Measured in WATTS (W)

ELECTRIC CURRENT TEST REVIEW. A. Series B. Parallel C. BothD. Neither 1. C Potential difference and current are directly related. 2. A A(n) _____ circuit.

Practical Electricity. Topics Electrical Energy & Power Electricity Generation Electrical Safety 3 Pin Plug.

Power and Energy. Power Power means work over a time period Units = Watts Electric power is measured in Watts.

Electricity. Contents Circuits Circuits Current in a Series Circuit Current in a Series Circuit Current in a Parallel Circuit Current in a Parallel Circuit.

Electric Power, AC, and DC Electricity

Power Grid and Your Home

Pages  In this PowerPoint, write down everything that is RED!!

To bring electric current into a building, an electrician installs wiring. In a house, all of the wires usually come from one main box.

Using Electrical Formulae Using the formulae you have been taught (V=IR, P=VI, Energy in kWh = kilowatts x hours) first of all work out which formula you.

Chapter Twenty One: Electrical Systems

Warm-up Activity Think about your experience with the PhET circuit simulation that you recently completed Record in your notebook: –Two things that you.

13 Electric Circuits.

L 27 Electricity and Magnetism [4]

Chapter 17.3 – Circuits electric circuit – a set of electrical components connected such that they provide one or more complete paths for the movement.

34.11 Electric Power Electric power is equal to the product of current and voltage.

Chapter 19: Electric Charges and Currents

Energy and Electricity. Basic ideas… Electric current is when electrons start to flow around a circuit. We use an _________ to measure it and it is measured.

Electrical Systems.

Physics Electricity in the home. Direct current (d.c.) is an electric current that always flows in one direction. Made by batteries. Electronic circuits.

Practical Electricity. Recap…  5 important formulae: Q = Charge (Coulomb) I = Current (Ampere) t = time (second) V = Voltage or potential.

ELECTRICITY: CHAPTER 7 Section 3 B. Protecting the Building  Two ways to control current in wiring  Fuse Contains a small wire that melts if too much.

Safety Features in mains circuits. Household wiring  Use p268 to answer the following questions 1.Where is your electricity generated and how does it.

Electric Circuits Series and Parallel Circuits. Circuit Diagrams An electric circuit is a complete path through which charge can flow Circuit diagrams.

ELECTRICITY IN THE HOME. Parallel Connections of Domestic Appliances Electricity boards distribute power to separate households using a pair of thick,

Physical Science Mr. Barry. Series circuits have one loop through which current can flow.

ELECTRICAL SYSTEMS. Chapter Twenty One: Electrical Systems  21.1 Series Circuits  21.2 Parallel Circuits  21.3 Electrical Power.

Electricity Notes 5 Electric Power – the rate at which _______________________ the rate at which _____________________ is converted into another form of.

Power. Your Utilization of Electricity Have you ever heard the word Watt before? Have you ever used the word Kilowatt before? When? When a person is speaking.

Practical Electricity. Topics Electrical Energy & Power Electricity Generation Electrical Safety 3 Pin Plug.

Topic 7: Measuring Electric Power. Getting electricity to your home Power generating station  transmission lines  home Step- up transformer Step- down.

19.2 Domestic electricity Paying for electrical energy  Most of the electrical appliances in your home use mains electricity.  Mains electricity: alternating.

Electrical Circuits Chapter 20 Section Three. Science Journal Entry #42 Expound upon Ohm’s Law and its relationship to current, resistance, and voltage.

Electrical power pg. 49. Objectives Use the equation for electrical power to solve circuit problems. Understand basic concepts for home electricity usage.

ELECTRIC POWER. POWER AT HOME When you plug in a device, you are using alternating current (AC) Both (+) and (-) … alternates at 60x /second (60Hertz)

Direct current Cells and batteries supply electric current which always flows in the same direction. This is called direct current (d.c.). Direct current.

Electricity. Electricity is a flow of electrons (negative charge) through wires and components. The rate at which electrons flow is called current. Current.

Circuits. Reviewing terms Circuits need 3 basic parts: An Energy Source Load (Power demand) Wires.

Electrical Circuits Section 7.3. Electrical Circuits Circuits rely on generators at power plants to produce a voltage difference across the outlet, causing.

ELECTRICAL ENERGY AND POWER

Electrical Systems Series Circuits Parallel Circuits Electrical Power.

Measuring Electrical Energy

Electricity, Sound and Light

Energy Consumption: HOME.

Using Electrical Formulae

Energy Consumption: HOME.

Electricity 7-3 Circuits.

Electrical Calculations

Topic H: Electrical circuits Fuses/circuit breakers and energy usage

Chapter 43 Uses & Effects of Electricity

Top 10 List – Electrical Energy

Direct and Alternating Current

Energy Consumption: HOME.

The heating effect of an electric current

Chapter Twenty One: Electrical Systems

Power, Energy and Electrical Safety

Presentation transcript:

Electricity in the home Chapter 52

Fuses A fuse is a safety device which cuts off the current in a circuit if the current goes above a certain level. The thin fuse wire overheats and melts and so breaks the circuit. Fuses are now replaced by circuit breakers.

Plugs Brown wire = Live wire connected to the fuse. Blue wire = neutral connected to the left hand side of the plug. Yellow green=Earth wire. Connected to the metal casing of the electrical device and runs to a metal plate buried in the ground

Measuring Electricity The watt is the unit of electrical power. It is a measure of how quickly an electrical appliance converts electrical energy to other forms of energy. E.g. A 100 watt light bulb converts 100 Joules of energy into light every second. The ESB use a unit called the kilowatt-hour(kWh). A kilowatt-hour is the electric energy used by a 1 kw appliance for 1 hour. No. of kilowatt-hrs = No. of kilowatts x No of hours

Examples A 6 kw cooker is on for half an hour. a) How many units does it use? b) If each unit costs 11.5 cents how much does the electricity cost? Answer a) No of units = 6 x 0.5hrs = 3kWh(units) b) Cost = 3 x 11.5 = 34.5 cent

Example 2 If each unit of electricity costs 12 cents, calculate the total cost of using a 1500 W electric heater for 2 hours, a 150 W freezer for 4 hours, a 1000W hoover for 12 minutes, a 1200W iron for 10 minutes and an 8kW electric shower for 15 minutes. Answer: Total No of units = (1.5 x 2) + (0.15 x 4) + (1 x 1/5) + (1.2 x 1/6) + (8 x 1/4) = = 6kWh or 6 units. Cost of electricity = 6 units x 12 cents = 72 cents

Example 3 Question The reading on an electricity bill 2 months ago was 21,185.Now the reading is 21,935. The price per unit is cent. The standing charge is 6.52 euro and 13.5% is then added. What is the total bill for electricity over these 2 months? Answer No of units = present - previous = = 750 Cost of electricity = 750 x = Standing charge = 6.52 Total (before VAT) = % = Total including VAT =

Electrical Power Electrical power can be calculated using the formula Power = Voltage x current (watts) (volts) (amps) The power rating of any electrical appliance is always marked on it. The ESB provides a voltage of 220 V. Knowing these two values we can calculate the current an appliance uses. Current(amps) = Power(watts) Voltage(volts)

Example Given the mains voltage is 220 V calculate the current flowing and the fuse s needed in a) 2.4 kW kettle b) a 720 W toaster. Answer a) Current(I) = P / V b) Current = P/V = 2400W / 220 = 720 W/ 220V = 10.9 A = 3.3 A Fuse needed :13 AFuse needed:5 A

Alternating current and Direct current Direct Current (d.c.) travels in one direction only. Alternating current (a.c.), supplied by the ESB changes direction many times per second. a.c. can be converted to d.c. using a rectifier.

Homework Textbook Chapter51-ElectricityintheHome A1.Fuse,melts,circuitbreakers. A2.Earth,live. A3.Watt,changes. A4.Kilowatthour,kWh. A5.Direct,d.c.,

B1. (a)230V. (b)Whenthecurrentinthecircuitgetstoohig h,theheatingeffectcausesthethinfusewiret omelt,breakingthecircuit. (c)Itdoesnothavetobereplacedwhenittrips. (d)Onthelivewire,itcutsoffallcurrenttothe appliance. (e)(i)30A;(ii)10A.

B2. (a)A=neutral,B=earth,C=live. (b)A=blue,B=yellow/green,C=brown. (c)Replacethe13Afusewitha3Afuse. (d)Themetalcasetoacopperrod,buriedinth eground. (e)Ifthemetalcaseofanappliancebecameliv e,theearthwirewouldcarrythecurrentsafel ytoearth.

B3. (a)2kW. (b)12units. (c)€1.80. (d)€1.20. (e)€0.90. (f)Kilowatthour. (g)806.

B4. (a)Fuse. (b)X=neutral, Y=live. (c)Thefuseisplacedonthelivewireforsafetyreasons.I fafaultdevelopsandthefuseblows,itwillcutoffallcur renttotheappliance. (d)Parallel. (e)Thebulbsshinebrighter;ifonefails,theotherskeep lighting. (f)Anearthwire. (g)3x100=300W=0.3kW;5x24=120hours;0.3x120x 0.15=€5.40.(h)Atwo- wayswitchisfoundinthehallandlanding.