Magnetism and Electricity
Grade 6 · Science · Study Guide
Explore the invisible forces of magnetism and electricity and how they are connected.
Magnetism and electricity seem like totally different forces, but they are actually two aspects of the same fundamental force: electromagnetism. Understanding them is key to understanding most of the technology we use every day.
Magnets have two poles — north and south. Opposite poles attract (north attracts south), and like poles repel (north repels north). Every magnet is surrounded by a magnetic field — an invisible region where magnetic forces act. Earth itself is a giant magnet with a north and south magnetic pole, which is why compass needles align with it.
Electricity involves the flow of charged particles. In a conductor (like copper wire), electrons can flow freely. When electrons flow through a circuit, it creates an electric current measured in amperes (A). The force that pushes electrons through a circuit is voltage (V). The resistance a material offers to current flow is measured in ohms (Ω). These three relate through Ohm's Law: Voltage = Current × Resistance (V = IR).
Current can flow through a series circuit (one path, all components in a line) or a parallel circuit (multiple paths, each component has its own branch). If one bulb burns out in a series circuit, they all go out. In a parallel circuit, the others stay on — this is why homes are wired in parallel.
The connection between magnetism and electricity is profound: moving a wire through a magnetic field generates electricity (this is how generators work), and passing electricity through a wire creates a magnetic field around it (this is how electromagnets work). This relationship is the basis for motors, generators, and transformers that power modern civilization.
| Feature | Series Circuit | Parallel Circuit |
|---|---|---|
| Current path | One path | Multiple paths |
| If one component fails | All components stop working | Others continue working |
| Voltage across components | Shared / split | Same for each component |
| Example use | Old holiday lights | Home electrical wiring |
Key terms
- Magnet
- An object that produces a magnetic field and attracts ferromagnetic materials like iron.
- Magnetic poles
- The two ends of a magnet (north and south); opposite poles attract, like poles repel.
- Electric current
- The flow of electrons through a conductor; measured in amperes (A).
- Voltage
- The electrical pressure or force that drives electrons through a circuit; measured in volts (V).
- Resistance
- Opposition to the flow of electric current; measured in ohms (Ω).
- Ohm's Law
- V = IR; voltage equals current times resistance.
- Series circuit
- A circuit where all components are connected in a single path; if one fails, all fail.
- Parallel circuit
- A circuit where components have separate paths; if one fails, others continue working.
Flashcards
- Magnetic poles
- North and south ends of a magnet; opposites attract, like poles repel.
- Electric current
- Flow of electrons through a conductor; measured in amperes (A).
- Voltage
- Electrical force pushing electrons through a circuit; measured in volts (V).
- Ohm's Law
- V = IR: Voltage = Current × Resistance.
- Series circuit
- Single-path circuit; one failure stops everything.
- Parallel circuit
- Multi-path circuit; used in homes; one failure doesn't stop others.
Practice questions
What happens when the north poles of two magnets are brought together?
- They attract each other
- They repel each other
- They cancel out
- Nothing happens
Show answer
Answer: They repel each other
Like poles repel each other. Two north poles or two south poles push apart. Only a north and a south pole will attract.
In a parallel circuit, if one bulb burns out, the others stay on.
Show answer
Answer: True
In a parallel circuit, each component has its own independent path to the power source. A break in one branch doesn't interrupt the others.
The resistance of a material to electric current is measured in ___.
Show answer
Answer: ohms
Resistance is measured in ohms (Ω), named after Georg Ohm who discovered the relationship between voltage, current, and resistance.
According to Ohm's Law, if voltage is 12V and resistance is 4Ω, what is the current?
- 48 A
- 8 A
- 3 A
- 0.33 A
Show answer
Answer: 3 A
Using Ohm's Law: I = V/R = 12V ÷ 4Ω = 3 amperes.
Moving a wire through a magnetic field can generate electricity.
Show answer
Answer: True
This is electromagnetic induction — the principle behind generators and power plants. Moving a conductor through a magnetic field induces an electric current.
Fun facts
- The Earth's magnetic field protects us from harmful solar radiation — without it, life on Earth's surface would be very difficult.
- The world's most powerful continuous magnet (at the National High Magnetic Field Laboratory) is 45 Tesla — about 900,000 times stronger than Earth's magnetic field.
- Lightning bolts can carry up to 1 billion volts of electricity and reach temperatures of 30,000 Kelvin — five times hotter than the sun's surface.
Get a personalized course on Magnetism and Electricity built around your child.