How can we change the current in a circuit? 15 May 2019 How can we change the current in a circuit? Key terms: resistance and resistor Secure: I can define the key terms; resistance and resistor and draw the symbols. I can explain why the current increases when the voltage supply is increased and describe how the resistance of a wire varies with length and thickness. Develop: Exceed: Starter: Assessment; student work in groups to come up with statements. Feedback; Each table group reads out their statements. The rest of the class guess and correct false statements. Actions; Discuss or explain any concepts that students are having difficulty with. I can explain how a variable resistor works. Starter: True / false – in table groups come up with 5 statements.

By the end of the lesson…

TASK: Prove it for points: Secure 1. Define the terms resistance and resistor. 5 2. Draw out and label the symbol for a resistor and variable resistor Develop 3. Explain what the size of the current is dependent upon. 10 4. Stick in the graph. Describe the pattern between voltage and current. Explain which resistor has the greatest resistance. 5. Complete Question 1 from the worksheet ‘Voltage and resistance 2’. Exceed 6. Complete Questions 2 and 3 from the worksheet ‘Voltage and resistance 2’ to explain how variable resistors work. 20 60p = 4+ 50 = 4- 40 = 3 30 = 2 20 = 1

Answers:

Secure: Develop: Exceed: Confidence Check I can define the key terms; resistance and resistor and draw the symbols. I can explain why the current increases when the voltage supply is increased and describe how the resistance of a wire varies with length and thickness. Develop: Exceed: Assess pupils by asking them to express their confidence in their achievement from 1-5 for the lesson aims. I can explain how a variable resistor works.

It’s the end of the lesson…