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Similar to Outcome 2.1 & 2.2 identify and use internationally recognised (si) units of measurement for general and specifically to electrical variables
Similar to Outcome 2.1 & 2.2 identify and use internationally recognised (si) units of measurement for general and specifically to electrical variables (20)
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Outcome 2.1 & 2.2 identify and use internationally recognised (si) units of measurement for general and specifically to electrical variables
- 1. 08/2 – Understand standard units of measurement used in electrical installation, maintenance and design work. Outcome 2.1/2.2 – Standard form (SI) and formula transposition Unit 08 Principles of electrical science
- 2. 1.1 Understand mathematical principles which are appropriate to electrical installation, maintenance and design work. Last session
- 3. 2.1 - Identify and use internationally recognised (SI) units of measurement for general variables. 2.2 - Identify and determine values of basic SI units which apply specifically to electrical variables. Current, potential, resistance, resistivity, temperature, force, magnetic flux, magnetic flux density, period, frequency, power, energy, time, length, area, mass, weight. 1.1 - Transpose basic formulae. (reminder) This session
- 9. Formula Resistivity, length and area
- 11. period, frequency and time
- 12. Periodic time Frequency period, frequency and time
- 13. period, frequency and time Formulas?
- 14. magnetic flux, magnetic flux density and area
- 15. magnetic flux, magnetic flux density and area Magnetic flux is how strong a magnet is. Magnetic flux is given the symbol Φ and is measured in units called Webers (Wb).
- 16. magnetic flux, magnetic flux density and area Magnetic flux density is how much magnetism there is in an area Magnetic flux density is given the symbol B and is measured in units called Telsas (T).
- 17. magnetic flux, magnetic flux density and area Formula Flux (Φ) = Flux density (B) x area (A) Φ = BA Transpose
- 18. Mass and weight What is the difference between mass and weight? Mass = 80 kg Mass = 80 kg Weight = 0 Weight = 80 × gravity
- 19. Mass and weight Gravity on earth = 9.81m/s² Gravity on moon = 1.62m/s²
- 20. Mass and weight Formula Weight (N) = mass (kg) x gravity (9.81) Transpose
- 21. Mass and weight Earth Moon Mercury Venus Mars Pluto Surface Gravity (compared to Earth) 1 0.17 0.38 0.90 0.38 0.06 How much you can lift 10 kg 60 kg 30 kg 10 kg 30 kg 170 kg How high you can jump 20 cm 120 cm 53 cm 22 cm 53 cm 340 cm How long it takes to fall back to the ground 0.4 s 2.4 s 1.1 s 0.4 s 1.1 s 6.8 s How far you can kick a ball 20 m 120 m 53 m 22m 53 m 340 m
- 22. Force Measured in Newtons (N) Distance Measured in metres (M) Energy Same as work done measured in Joules(J) symbol W Force, distance and energy
- 23. Formula Work done/energy(Joules) = Force(N) x Distance(m) transpose Force, distance and energy
- 24. 2.1 - Identify and use internationally recognised (SI) units of measurement for general variables. 2.2 - Identify and determine values of basic SI units which apply specifically to electrical variables. Current, potential, resistance, resistivity, temperature, force, magnetic flux, magnetic flux density, period, frequency, power, energy, time, length, area, mass, weight. 1.1 - Transpose basic formulae. (reminder) Consolidation
- 25. Outcome 1 formative assessment Next session
Editor's Notes
- Speaker notes Remind the learners that, as well as maths, they also need to understand some scientific and mechanical concepts, e.g. the difference between weight (a force) and mass. Mass is the amount of matter in a body. It is measured in kilograms. The confusing thing is that in everyday language we use kilograms to talk about weight. All bodies on Earth (and on any planet) are subjected to a pull, as proven by the fact that if you let go of an object above a surface, it will fall and not float where you left it. This pull is called gravity, and weight is the result of the application of that pull on a mass. The gravitational pull acts on a mass downwards, so you can say that weight is the force that you need to apply in order to lift a mass. Weight is actually measured in newtons (N). Ask: What is gravity as a figure? (We generally use 9.81 m/s2.) Ask: How much do you actually weigh? (Learners’ weight (if willing to say))
- Speaker notes Remind the learners that, as well as maths, they also need to understand some scientific and mechanical concepts, e.g. the difference between weight (a force) and mass. Mass is the amount of matter in a body. It is measured in kilograms. The confusing thing is that in everyday language we use kilograms to talk about weight. All bodies on Earth (and on any planet) are subjected to a pull, as proven by the fact that if you let go of an object above a surface, it will fall and not float where you left it. This pull is called gravity, and weight is the result of the application of that pull on a mass. The gravitational pull acts on a mass downwards, so you can say that weight is the force that you need to apply in order to lift a mass. Weight is actually measured in newtons (N). Ask: What is gravity as a figure? (We generally use 9.81 m/s2.) Ask: How much do you actually weigh? (Learners’ weight (if willing to say))
- Speaker notes Remind the learners that, as well as maths, they also need to understand some scientific and mechanical concepts, e.g. the difference between weight (a force) and mass. Mass is the amount of matter in a body. It is measured in kilograms. The confusing thing is that in everyday language we use kilograms to talk about weight. All bodies on Earth (and on any planet) are subjected to a pull, as proven by the fact that if you let go of an object above a surface, it will fall and not float where you left it. This pull is called gravity, and weight is the result of the application of that pull on a mass. The gravitational pull acts on a mass downwards, so you can say that weight is the force that you need to apply in order to lift a mass. Weight is actually measured in newtons (N). Ask: What is gravity as a figure? (We generally use 9.81 m/s2.) Ask: How much do you actually weigh? (Learners’ weight (if willing to say))
- Speaker notes Remind the learners that, as well as maths, they also need to understand some scientific and mechanical concepts, e.g. the difference between weight (a force) and mass. Mass is the amount of matter in a body. It is measured in kilograms. The confusing thing is that in everyday language we use kilograms to talk about weight. All bodies on Earth (and on any planet) are subjected to a pull, as proven by the fact that if you let go of an object above a surface, it will fall and not float where you left it. This pull is called gravity, and weight is the result of the application of that pull on a mass. The gravitational pull acts on a mass downwards, so you can say that weight is the force that you need to apply in order to lift a mass. Weight is actually measured in newtons (N). Ask: What is gravity as a figure? (We generally use 9.81 m/s2.) Ask: How much do you actually weigh? (Learners’ weight (if willing to say))