Lesson Plan: P1.2.03

Learning About
What factors affect resistance?

Keywords:

Resistance: Resistance, measured in Ohms, tells us how hard it is for a current to flow through a circuit component. (2)
Potential difference: The potential difference between two points in an electric circuit is the work done when a coulomb of charge passes between the points. (2)
voltmeter: An instrument used to measure potential difference. (2)
Current: The flow of charge in a circuit. (2)
Ammeter (1)
Resistance (1)
Potential difference (1)
Current (1)

Memory Anchor:

Method	Precise Learning Objective	Linked	Question / Activity (Designed for maximum working out)	Stepping Stones	Pitstop Check (Thinking Map)
	Current, potential difference or resistance can be calculated using the equation: potential difference = current ? resistance V = I R		How are current, potential difference and resistance linked by an equation? Diffrentiated questions using the equation V= I R
	The current (I) through a component depends on both the resistance (R) of the component and the potential difference (V) across the component.		What does the current through a component depend on? Draw a current (amps) against potential difference (volts) graph.
	Students should be able to explain that, for some resistors, the value of R remains constant but that in others it can change as the current changes.		What is the difference in function between a resistor and a variable resistor?

Links To the Big Ideas
Forces	Particles	Energy	Cells