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Cause and Effect — From Current to Useful Effects
The chain of ideas
Electric current makes a magnetic field around a wire. A coil with an iron core becomes a strong electromagnet. The same current also faces resistance and makes heat. Cells and batteries supply this current from chemical reactions inside them.
Mind Map
ELECTRICITY: MAGNETIC & HEATING EFFECTS
Magnetism, Heat & Batteries
Key Terms and Definitions
- Magnetic Effect of Electric Current
- Current through a conductor makes a magnetic field around it.
- Magnetic Field
- The region around a magnet or current carrying wire where its effect is felt.
- Electromagnet
- A current carrying coil that behaves as a magnet, often with an iron core.
- Lifting Electromagnet
- A strong electromagnet on a crane that lifts heavy iron and steel.
- Poles
- The two ends of a magnet or electromagnet, called North and South.
- Heating Effect of Electric Current
- A conductor gets heated when current passes through it.
- Resistance
- The opposition a conductor offers to the flow of current.
- Nichrome Wire
- A wire of high resistance used in heating devices.
- Heating Element
- The rod or coil in an appliance that gets hot with current.
- Cell
- A device that makes current from chemical reactions inside it.
- Voltaic Cell
- A cell with two metal electrodes in a liquid electrolyte.
- Electrode
- A metal plate in a cell that connects to the circuit.
- Electrolyte
- The liquid or paste in a cell that helps make current.
- Dry Cell
- A single use cell with a paste electrolyte and a carbon rod.
- Rechargeable Battery
- A battery that can be charged and reused many times.
- Dead Cell
- A cell whose chemicals are used up, so it makes no current.
