Electricity
You switch on a light, and the room is bright at once. A heater warms the room, and a phone charger fills a battery. All of them use electric current. In this chapter we find out what current is, what pushes it through a wire, and what makes a wire resist it. We join resistors in series and in parallel, we measure the heat that a current makes, and we learn how to find the power and the cost of an appliance. Python helps us calculate and draw.
Part of Physics · High School (9–10) (chapter 8)
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Current, Potential Difference and Ohm's Law
A torch has a battery, a switch and a bulb. Close the switch, and the bulb lights. In this course we find what flows in the wire, what pushes it, and how the current, the push and the resistance are connected by Ohm's law.
Resistance and Combinations of Resistors
A thin wire resists the current more than a thick one, and a long wire more than a short one. In this course we find what decides the resistance of a wire, and we join resistors in series and in parallel. We also see why the lights of a house are always joined in parallel.