Electricity Fundamentals - Definitions, Models, and Calculations

Starter Starter Match the word (letter) to it s definition (number) A - current 1 used to measure the current 2 the unit of resistance B potential difference (voltage) C - ohms 3 the flow of electrons in a circuit 4 used to measure the voltage D - voltmeter 5 the difference in potential energy between 2 points 6 how difficult it is for current to flow E - resistance F - ammeter Extension: begin creating an electricity definitions page in your book

Starter Starter I have a balloon and I want it to stick to the wall. What do I have to do? Why does it eventually stick to the wall? Which (subatomic) particle moves?

Starter Starter Cut out the circuit symbols and match them to the correct component. Extension: begin some P2 revision.

Objectives Objectives Recall what current and voltage mean Escribe how an electrical circuit can be modelled Be able to calculate the charge flow in a circuit

How do we model electricity? How do we model electricity? 1. What does the rope represent? 2. What does the person pushing the people represent? 3. What do the people represent? 4. What does each marble represent? What does the flow of marbles represent? 5. What does the giving up of marbles represent? Extension: draw a diagram of the model. https://www.youtube.com/watch?v=WvcwCttJjtI

Calculating charge using current Calculating charge using current Charge flow = current x time Charge flow is measured in coulombs (C) Current is measured in amps (A) Time is measured in seconds (s) What will the equation triangle look like?

Changing units 1 mA = 0.001 A If the current is given in mA, divide it by 1000 to change it into A Remember: 1kA = 1000 A If the current is in kA multiply it by 1000

Changing Units Changing Units Change the following into Amps (A): 1. 50 mA 2. 4 mA 3. 32 kA 4. 102 kA 5. 75 mA 6. 12 kA Extension: questions 1 4 page 81

Task Task Have a go at the calculating charge flow questions. Remember; you may have to calculate current or time as well! Extension: questions 1 4 on page 81

Plenary Plenary 1. What does the person pulling the rope in a circuit represent? 2. How do we calculate charge flow? 3. Which direction do the electrons (current) flow in a circuit?