Electricity and Magnetism (All Topics)

A balloon becomes positively charged when it _______.

• Has lost protons

• Has gained protons

• Has lost electrons

• Has gained electrons

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In a power plant, ____ is the device that converts mechanical energy produced by turbines into electrical energy.

• Transformer

• Generator

• Motor

• Circuit

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When a current is running through a wire in the wall of a home, how can the electrician know the direction of the magnetic field?

• use a transformer to measure the voltage

• point his fingers in the direction of the current and observe the direction his thumb points

• point his thumb in the direction of the current and observe the direction his fingers curl

• turn the switch on and off and feel for the electrons to pass his face

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Imagine you're at a science museum, and there's an exhibit where a balloon sticks to a wall after being rubbed on your hair. What is the name given to locations in space where the balloon experiences a force?

• Force field

• Electric field

• Magnetic field

• Gravitational field

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If a balloon sticks to a wall after being rubbed on your hair, the charges on the balloon and the wall must be __.

• The same

• Opposite

• Neutral

• Either the same or opposite

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In a power distribution system, transformers are primarily used to __.

• Produce energy

• Convert voltages

• Store energy

• Reduce resistance

What causes the curernt to flow and the lights in your home to turn on when you flip the switch?

• A difference in heat

• A difference in conductivity

• A difference in pressure

• A difference in potential energy (voltage)

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When placing the north pole of one magnet near the south pole of another magnet, they will ___.

• Always found in pairs

• Repel each other

• Attract each other

• Can exist independently

Imagine you are working on an electrical engineering project and you need to determine the direction of the magnetic field around a wire that is carrying current. Which rule would you use?

• right-hand rule

• left-hand rule

• Faraday's rule

• Coulomb's rule

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During a solar storm, what does Earth's magnetic field protect us from?

• asteroids

• Solar wind

• space junk

• None of the above