Intro to Electricity

What is the distance light travels in one second?

• 300,000 kilometers

• 150,000 kilometers

• 450,000 kilometers

• 600,000 kilometers

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What assumption is made about the wires in the giant circuit for it to work?

• The wires have high resistance

• The wires have no resistance

• The wires are 100,000 kilometers long

• The wires are insulated

How does electrical energy get from a power plant to your home?

• Through direct current

• By electrons traveling the entire distance

• In the form of alternating current

• Via water flow

What does the Poynting vector represent?

• How much electromagnetic energy is passing through an area per second

• The amount of electricity used by a device

• The resistance in a circuit

• The speed of light

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What is the correct answer to the giant circuit light bulb question?

• Two seconds

• 1/C seconds

• One second

• Half a second

What was a major breakthrough in our understanding of the universe in the 1860s and 70s?

• The creation of the first battery

• The realization that light is made up of oscillating electric and magnetic fields

• The invention of the light bulb

• The discovery of the electron

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What is the primary way energy is transmitted from power plants to homes?

• Through the movement of electrons

• Through oscillating electric and magnetic fields

• Via direct physical contact

• By mechanical means

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Why did the first Trans Atlantic cable only work for about a month?

• It was not waterproof

• Signals became distorted and lengthened

• There was a manufacturing defect

• It was attacked by sea creatures

What incorrect assumption is often made about how electricity is transmitted?

• That it involves the flow of water

• That it's similar to the flow of air

• That it's transmitted through sound waves

• That you're buying electrons

What did James Clerk Maxwell realize about light?

• That it is a particle

• That it is made up of oscillating electric and magnetic fields

• That it can be seen by humans

• That it travels in a straight line

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