Courses
Teacher-curated, self-paced courses. Looking for a guided sequence through a full topic? See Learning Paths.
7 courses
Current, Drift Velocity and Resistivity
Physics · High School (11–12) · Current Electricity
FreeCh 17 · 1/3
Electric current and the drift of electrons, mobility, Ohm's law at the level of the material, resistivity and conductivity, how resistance changes with temperature, and the colour code of resistors.
3Lessons11Problems2Python Labs1Question Set1Mock Test
Cells, the Meter Bridge and the Potentiometer
Physics · High School (11–12) · Current Electricity
FreeCh 17 · 3/3
Cells in series, in parallel and in mixed groups, and the EMF and terminal voltage of a cell. Then the meter bridge for an unknown resistance, and the potentiometer for comparing EMFs and finding an internal resistance.
3Lessons12Problems2Python Labs1Question Set1Mock Test
Electromagnetic Induction and Household Circuits
Physics · High School (9–10) · Electromagnetic Induction, Current Electricity
FreeCh 9 · 3/3
A power station makes electricity by turning a coil in a magnetic field. In this course we find how a moving magnet makes a current in a coil, we study the generator and the alternating current that it gives, and we learn how the wiring of a house is made, and how it is kept safe.
3Lessons12Problems2Python Labs1Question Set1Mock Test
Current, Potential Difference and Ohm's Law
Physics · High School (9–10) · Current Electricity
FreeCh 8 · 1/3
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.
3Lessons12Problems2Python Labs1Question Set1Mock Test
Resistance and Combinations of Resistors
Physics · High School (9–10) · Current Electricity
FreeCh 8 · 2/3
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.
3Lessons13Problems2Python Labs1Question Set1Mock Test
Heat, Power and Energy at Home
Physics · High School (9–10) · Current Electricity
FreeCh 8 · 3/3
A heater gets hot, but the wire that brings the current to it stays cool. A bulb that is rated 100 W uses more electricity than one that is rated 40 W. In this course we find how much heat a current makes, what the power of an appliance means, and how to work out the energy that a house uses and the bill for it.
3Lessons13Problems2Python Labs1Question Set1Mock Test
Electric Circuits
Physics · High School (11–12) · Current Electricity
Why does a bulb get dimmer when you add a second bulb in series? Why do the lights in your house stay bright when you switch on a fan? In this course we learn how current, voltage and resistance fit together. We start with Ohm's law and resistors in series and in parallel. Then we use Kirchhoff's two rules to solve circuits with more than one battery, and we let Python check our work. It is a solid base for Class 11 and 12 exams, and for JEE and NEET circuit questions.
3Lessons6Problems2Python Labs2Question Sets2Mock Tests