Energy Cost Calculations

Slides:

Advertisements

Similar presentations

Advertisements

Lesson 3: Buying Electricity.  MUST understand how electric current transfers energy  SHOULD calculate the cost of energy used  COULD use appropriate.

P1.3 Electrical Energy. Power Power (watts) = Energy Transferred (joules) Time (seconds) This means the more powerful something is, the more energy is.

Chapter 15 Power. just like the word “work”, power has a different meaning in the science world power tells you how fast work is being done.

Electrical energy consumption Section 9. Lighting 40 Watts 100 Watts 60 Watts.

Power Calculations Noadswood Science, 2011.

Measuring Electrical Energy Lesson 11. Measuring Electrical Energy What is Energy? Energy- The ability to do work Electrical Energy- The energy transferred.

 POWER: the rate of change in energy; also the rate at which work is done or energy is transformed  JOULE (J): the unit for measuring energy  WATT.

Electrical Power Lesson Objectives:

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

Electrical Appliances and Power. Learning Objectives To be able to calculate power, and cost of electricity To be able to apply these calculations to.

Write down the energy transfers in the following:

Who Killed the Electric Car?

Cost of electricity Objectives Be able to calculate the cost of electrical devices. HSW: AF2: Evaluate the effects of technological developments on society.

Current Electricity Current, Power and Energy. Current Electricity Current Electricity is what you get when you plug something into the wall. There are.

ENERGY.  Energy is measured in Joules (J)  A joule is a small unit of energy NOT JEWELS like these -> JOULES.

Power Revisited.  Power is the rate at which work is done. P = W t  Since work = a change in energy, power is the rate at which energy (changes) is.

Chapter 6 Section 1 Work and Machines. Define work: __________________________________________ What 2 conditions apply to work? 1.________________________________________.

Paying for Electricity How much does it cost to watch T.V. for 2 hours?

Units Of Electricity Ashfield Direct Learning Holly Millar Ks4 Energy.

Electrical Power & Energy Chapter 7-3. Electrical Power F Power is the rate at which work is done F Electrical energy is easily converted into other forms.

Calculate the missing quantities for the circuit below.

Power and Energy. Power Electric power - the rate at which electric energy is transformed into another form of energy such as light or heat. P=IV P =

Electrical Power & Efficiency.  I will be able to calculate cost to operate and percent efficiency of various devices.

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.

Electric Power Lesson 2.5. Key Concepts How do you calculate electric power? What factors are used to determine how people pay for electrical energy?

ENERGY. Energy  Energy is measured in Joules (J)  A joule is a small unit of energy NOT JEWELS like these -> JOULES.

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

Energy Consumption Energy consumption is measured in kilowatt. hours. A kilowatt hour is the amount of energy being consumed per hour. –Energy (kwh) =

| resources for science teachers who like to think TopicElectrical powerLevelFor students aged

Electrical power. What is electrical power? Electrical power is the rate at which an electrical appliance uses electrical energy. All appliances have.

Buying electricity. Calculating the units of electricity The amount of electrical energy (i.e. the amount of electricity) used by an appliance depends.

P.1 Book 4 Section 3.1 Electrical power and energy Which one is brighter? Electrical power Power rating Check-point 1 Electrical energy Check-point 2 3.1Electrical.

P1 Physics Q2) Energy Transfer and Efficiency Nov 2015 exam revision.

P1.3 - Revision Energy – Transfer – Power - Efficiency.

Energy Calculations Revision Energy = Power x Time (Joule) (Watt) (Second) Energy Power x Time Example 1: How much energy does a 40 Watt bulb use in 2.

Power and Energy Energy Power

Electrical Systems Series Circuits Parallel Circuits Electrical Power.

Measuring Electrical Energy

Energy Consumption: CO$T.

Efficiency Hair dryer TV Lamp Toy Radio Heater Answer

The Cost of Electricity

Electric Power Energy Cost

Write your ideas in the first thought bubble!

Energy and Power for APES

Electrical Calculations

Conservation of Energy & Efficiency

Electricity Calculations:

Energy Calculations Objective

Date 4:Energy Diagrams Lesson Outcomes How I did Targets

Energy Consumption: CO$T.

The heating effect of an electric current

Power and electrical power

Energy and Power for APES

Equipment 5.4 is covered earlier on in the spec in some detail. This lesson combines 5.4 and 5.5. This lesson also recaps unit 1 and calculating kilowatt.

The Cost of Electrical Energy

Draw the symbols for the below components: Cell: Battery:

Electric Power.

Date 4:Energy Diagrams Lesson Outcomes How I did Targets

Warm up A light needs 3 amps to produce light the resistance of the bulb is 1.5 ohms. How many batteries do you need if each battery is 1.5 volts? What.

Notes 7.3 : Calculating Electric Power + Electrical Energy

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.

Presentation transcript:

Energy Cost Calculations 01/12/2018 Energy Cost Calculations Objective To calculate the energy transferred and associated costs of operating electrical devices.

Starter Discuss with a partner which is the best lightbulb and why? Plug in two mains powered lamps with the same (or very similar) brightness ratings, one filament and one low-energy. Ask students, in pairs or small groups, to discuss which lamp is the best and why. Incorporate the idea of the cost of the bulbs and ask students to reconsider their opinions. Reveal the power the bulbs are using. What do the students think now? Discuss further advances with LED lights.

Power The power is the amount of energy in a given amount of time. We can rearrange the formula to find the energy: Worked Example How much energy is used by a bulb, which needs 40W to power it, if it is left on for 3 hours. E = 40W x 3hours x 60 x 60 = 432,000J = 432kJ Power = Energy ÷ Time (Watt) (Joule) (Sec.) Energy = Power x Time Discuss the worked example with pupils and then get them to discuss why they need to multiply by 60 twice. Also discuss the conversion from J to kJ.

Calculating Energy Bills Energy suppliers use kW h (kilowatt hours) as the unit of energy to make calculating the cost of energy easier. Worked Example If a 2000 W electric heater is left on for 5 hours. Then the number of kW h used is: 2000 W = 2 kW Energy (in kW h) = Power (in kW) x Time (in hours) Energy (in kW h) = 2 kW x 5 h = 10 kW h Energy = Power x Time

Calculating Energy Bills Worked Example If a 2000 W electric heater is left on for 5 hours. Then the number of kW h used is: 2000 W = 2 kW Energy (in kW h) = Power (in kW) x Time (in hours) Energy (in kW h) = 2 kW x 5 h = 10 kW h Energy suppliers charge a set amount per kW h used. If an energy supplier charges 12p per kWh, then the heater would cost: Cost of Energy = number of kWh x cost of each kWh Cost of Energy = 10 x 12 p = 120 p = £1.20

Calculating Energy Bills Complete all parts of the question in your book. ss_th2_phys_term 4_l10_sq_energy calculations_q4

Plenary Draw a diagram, like the one below, and fill in the boxes with the parts of this topic you feel most confident with at the top and the least confident at the bottom. Use your book to help you. Examples: Calculating work done Sankey diagrams Energy types Energy transfers Calculating energy costs Energy Resources (Adv. Vs Dis.) Use the outcomes of the position of topics to tailor a revision lesson to the class.