19/08/2015 Current, Charge & Power Objectives To apply equations of power, electrical energy and potential difference to different situations. HSW: AF2.

Slides:

Advertisements

Similar presentations

+ V (Volt) = W (work done, J) Q (charge, C)

Advertisements

Cells have positive and negative electrodes.

ELECTRIC CURRENT AND VOLTAGE

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.

POWER Noadswood Science, POWER To understand, and be able to calculate power Monday, August 10, 2015.

P2.4.2 Current, Charge and Power P2 Physics P2.4.2 Current, Charge and Power P2 Physics Mr D Powell.

Year 12 Current Electricity Lesson 3 Potential difference and power

Electric charge Electric charge can be either positive or negative.

Electrical Power Lesson Objectives:

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

EMF. E.m.f and p.d - Learning Outcomes You should all be able to: define potential difference (p.d.); select and use the equation W = VQ; define the volt;

Circuits and Electronics. Circuits A circuit is a closed path through which a continuous charge can flow. A circuit is a closed path through which a continuous.

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

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

Electricity. What is electricity? Electric current – flow of electrons through a _______ Current (I) is measured by how many __________pass a given point.

Unit G482: Electrons, Waves and Photons

Twenty Questions Electricity 2. Twenty Questions

Twenty Questions Electricity 2. Twenty Questions

2c) Energy and Potential Difference in Circuits Part 1 Current and Charge.

Electric Current. When electric charges (electrons) move from one place to another, they are known as an electric current Current is defined as the amount.

Power and electrical power 12 March 2016 Keywords: Power, Energy, Weight, Force Objectives Understand what power is and be able to calculate it. HSW: AF5.

Current, Charge and Power Match up the electrical quantities, with their abbreviations and units. IVE powerampereΩ EnergyOhmsVoltage voltsresistancewatts.

13/06/2016 Unit 2 – Physics for your Future N Smith St. Aidan’s (EdExcel)

14/06/2016 Physics Unit 2b. 14/06/2016 P2.3.1 – Static Electricity.

Must Be Closed To Allow Electricity Flow; When Circuit Is Open No Electricity Flow CIRCUIT.

Dynamic Electricity. What is a conductor and insulator? A conductor is a material which allows an electric current to pass. Metals are good conductors.

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.

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.

Edexcel IGCSE Physics pages 74 to 81

Circuit Symbols.

Physical Science 7.3 Electrical Energy.

Year 12 Current Electricity Lesson 4a Pd, Power and Resistance

Voltage and Power.

Resistance By the end of this lesson, you will be able to…

Electric Current Chapter 34.

Warm Up #13 What is an electric current?.

Ch Electricity II. Electric Current (p ) Circuit

Electric Current, EMF and Electric Potential.

To understand how fuses and circuit breakers work.

Copy the list and draw as many as you can

Be able to describe how the resistance of LDRs and Thermistors varies.

Electric Fields and Current

Be able to describe how the resistance of a diode varies.

Static Charge to Electric Current

Be able to describe what resistance is and calculate it.

Power of Electrical Appliances

Dynamic Electricity.

Physical Science 7.3 Electrical Energy.

Potential Difference Objectives

Electricity Current.

Electric Potential.

Chapter 43 Uses & Effects of Electricity

Power AIM: To be able to use the power equations PRIOR KNOWLEDGE:

Electrical Quantities

OCR Gateway 2016 Physics topic 3

Ch Electricity II. Electric Current (p ) Circuit

The heating effect of an electric current

Equipment This lesson has a small focus on a new equation, other than that it is a small recap and equation practice. Calculators A r.

2 million kettles at 3kW each = 6GW

Electricity II. Electric Current Circuit Potential Difference Current

Voltage Difference The difference in electrical potential between two places. Unit of measure = V (volts) Voltage causes current to flow through an electric.

Electricity Physics 3: Current

Electricity and Circuits

Electric Current and Energy

Presentation transcript:

19/08/2015 Current, Charge & Power Objectives To apply equations of power, electrical energy and potential difference to different situations. HSW: AF2 – Understanding the applications and implications of science Used before in: lesson 3 – fuses and circuit breakers Will use again in: radioactivity PLTS: Team workers – Work collaboratively with others. Used before in: lesson 3 – fuses and circuit breakers Will use again in: radioactivity /watch?v=b0JLnF9A9P0 &noredirect=1

19/08/2015Outcomes All students should be able to apply the equation of power to different situations and understand that heat is given off by light bulbs and that different lights have different efficiencies. Most students should be able to recall the equation for power and apply the equations of charge and voltage to different situations. Some students may be able to derive the equation for electrical power and apply it.

19/08/2015Power Power is “the rate of doing work”. The amount of power being used in is given by: E tP Power = Energy used ÷ time in W in J in sec How do light-bulbs make light? How do energy efficient light bulbs make light? Now read p248: Can you describe 3 reasons to choose CFLs over normal bulbs? (what does CFL stand for?)

19/08/2015 Electrical Power Power is “the rate of doing work”. The amount of electrical power being used in is given by: P VI Power = Current x P.D in W in J in V

Power Questions 19/08/ Calculate the power of a television that uses 1200 J of energy in 4 seconds. 2. Calculate the power of a fire that uses J of energy in 8 seconds. 3. Calculate the power of a drill that uses J of energy in 1 minute. 4. Calculate the power of a radio that uses J of energy in 2 hours. 5. Calculate the power of a kettle that uses 7.2 M J of energy in 120 minutes. 6.How much energy does a light bulb of power 60 W give off in 12 seconds? 7.How much energy does an electric fire of power 3000 W give off in 1 minute? 8.How much energy does a shower of power 7 kW give off in 300 seconds? 9.How much energy does a light bulb of power 40 W give off in 6 hours? 10.How much energy does a kettle of power 1.5 kW give off in 3 minutes? 11. Calculate the time taken for a television of power 200W to use 1000 J of energy. 12. Calculate the time taken for a fire of power 3000W to use J of energy. 13. Calculate the time taken for a drill of power 150W to use 25 J of energy. 14. Calculate the time taken for a radio of power 2W to use 4 kJ of energy. 15. Calculate the time taken for a kettle of power 2kW to use 1 MJ of energy. 16. Calculate the power of a television that requires a current of 2A for a voltage of 230V. 17. Calculate the power of an electric fire that requires a current of 13A for a voltage of 230V. 18. Calculate the power of a light bulb that requires a current of 0.5A for a voltage of 230V. 19. Calculate the power of a charger that requires a current of 15mA for a voltage of 230V. 20. Calculate the power of a torch bulb that requires a current of 200mA for a voltage of 6V.

19/08/2015 Charge (Q) As we said, electricity is when electrons move around a circuit and carry energy with them. Each electron has a negative CHARGE. Charge is measured in Coulombs (C). We can work out how much charge flows in a circuit using the equation: Q TI Charge = current x time (in C) (in A) (in s)

19/08/2015 Example questions Charge (C)Current (A)Time (s) )A circuit is switched on for 30s with a current of 3A. How much charge flowed? 2)During electrolysis 6A was passed through some copper chloride and a charge of 1200C flowed. How long was the experiment on for? 3)A bed lamp is switched on for 10 minutes. It works on a current of 0.5A. How much charge flowed?

Voltage 19/08/2015

Proving E=VxQ 19/08/2015 Charge = current x time (in C) (in A) (in s) Power = Current x P.D in W in J in V Power = Energy used ÷ time in W in J in sec

Quiz 19/08/2015 1What happens when electric current flows through a wire? 2How does a filament lightbulb work? 3How does an energy efficient lightbulb work? 4What is voltage? 5What is electric current? 6What is power? 7What is electrical power?