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Questions and Answers
A student is investigating the resistance of different materials. Which of the following variables should be kept constant to ensure a fair test?
A student is investigating the resistance of different materials. Which of the following variables should be kept constant to ensure a fair test?
- Current flowing through the material
- Type of material
- Voltage across the material
- Length of the material (correct)
In a parallel circuit, what happens if one bulb blows out?
In a parallel circuit, what happens if one bulb blows out?
- The other bulbs become brighter.
- All the bulbs go out.
- The other bulbs remain lit. (correct)
- The battery voltage increases.
Which of the following statements accurately describes the relationship between voltage, current, and resistance according to Ohm's Law?
Which of the following statements accurately describes the relationship between voltage, current, and resistance according to Ohm's Law?
- Current is directly proportional to voltage and inversely proportional to resistance. (correct)
- Voltage is inversely proportional to current and resistance.
- Voltage is directly proportional to resistance and inversely proportional to current.
- Resistance is directly proportional to voltage and directly proportional to current.
Why does a material with low resistance allow current to flow through it easily?
Why does a material with low resistance allow current to flow through it easily?
If the number of coils in an electromagnet is increased, what happens to the strength of the magnetic field?
If the number of coils in an electromagnet is increased, what happens to the strength of the magnetic field?
What is the purpose of a switch in an electrical circuit?
What is the purpose of a switch in an electrical circuit?
In the particle model of matter, what type of subatomic particle is free to move through a conductor?
In the particle model of matter, what type of subatomic particle is free to move through a conductor?
How does increasing the length of a wire typically affect its resistance?
How does increasing the length of a wire typically affect its resistance?
Why are series circuits unsuitable for domestic lighting?
Why are series circuits unsuitable for domestic lighting?
A student is trying to determine the variables of the electromagnet shown. Which of the following is the correct label for the 'paperclips picked up' aspect of the experiment?
A student is trying to determine the variables of the electromagnet shown. Which of the following is the correct label for the 'paperclips picked up' aspect of the experiment?
Flashcards
Electric current
Electric current
The flow of electric charge.
Conductor
Conductor
A material that has low resistance and allows current to flow through it easily.
Insulator
Insulator
A material that has high resistance and does not allow current to flow through it.
Voltage
Voltage
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Voltage
Voltage
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Electrical resistance
Electrical resistance
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Series circuit
Series circuit
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Parallel circuit
Parallel circuit
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Current
Current
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Potential difference
Potential difference
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Study Notes
- The flow of electric charge is called electric current.
- A material that allows current to flow through it easily is a conductor.
- A material that resists current flow is an insulator.
- Voltage or potential difference is the "push" provided by a battery or power source.
- Resistance measures how difficult it is for current to pass through a component.
Series vs. Parallel Circuits
- In a series circuit, components are connected end-to-end in a single loop.
- If one bulb breaks in a series circuit, the circuit is no longer complete, and none of the other bulbs will light.
- In a parallel circuit, components are connected on separate branches.
- This provides multiple paths for current.
- If one bulb breaks in a parallel circuit, the other bulbs remain lit because the circuit is still complete.
Circuit Components and Measurement
- Ammeters measure current with a unit called "amps".
- Voltmeters measure potential difference with a unit called "volts".
- Resistance = Potential Difference / Current
Circuit Variables
- Independent variable - variable that you change.
- Dependent variable - variable that you measure in the investigation.
- Control variable - variable that remains the same.
Atomic Structure
- Atoms are composed of electrons, neutrons, and protons.
- Electrons have a negative charge (-1).
- Neutrons have no charge (0).
- Protons have a positive charge (+1).
- An atom has an equal number of protons and electrons.
- An atom has an overall neutral charge.
Electromagnetic Strength
- Electromagnet strength can be changed by modifying the number of coils.
- The greater the number of coils, the stronger the electromagnet.
- The stronger the electromagnet, the more paperclips it will pick up.
Magnetism
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Not all metals are magnetic.
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All magnets have a north and south pole.
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The Earth has its own magnetic field.
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Opposite poles attract.
-Cobalt, Iron and Nickel are magnetic.
Key Definitions
- Potential difference tells how hard battery pushes electrons around a circuit.
- Current is the flow of electrons around a circuit.
- The strength of an electromagnet can be changed by changing the number of coils of wire around an iron core.
- As the length of wire increases, resistance increases.
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