Chapter 11 Electrical Engineering

The values shown in the table below are a measure of how much current will flow in a standard

sample of metal when the sample is attached to a voltage source. Which metal is the best conductor of electricity?

• Aluminum

• Copper

• Iron

• Silver

One example of a device that uses electrical energy to produce a magnetic force that moves a

magnet to produce mechanical energy is a(n) —

• electrical generator

• electrical motor

• switch

• transformer

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One example of a device that moves a magnet to produce electrical energy is known as a(n) —

• electrical generator

• electric motor

• electromagnet

• transformer

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When a piece of glass is inserted into a simple circuit, the light bulb of the circuit does not light up.

Under these conditions this would mean the glass is a(n) —

• resistor

• conductor

• insulator

• capacitor

Observe the diagram of a circuit above. Each of the resistors depicted represents a light bulb.-----If the wire is cut at the point indicated by the arrow, what will happen to the brightness and current flowing through the other two lights?

• The lights will get brighter because the current increases through each light.

• The lights will get dimmer because the current decreases through each light.

• The lights will stay the same brightness because the current remains constant through each

  light.

• The lights will go out because the current is unable to flow through the broken circuit.

An open circuit —

• allows electricity to flow

• has no resistance

• requires little voltage

• does not allow electricity to flow

When a magnet is moved (mechanical energy) through the center of a coiled wire, what type of force is generated?

• Gravitational

• Magnetic

• Mechanical

• Electric

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Observe the diagram of a circuit above. Each of the resistors depicted represents a light bulb. -----

If the circuit breaks at the point indicated by the arrow, what will happen to the brightness and current flowing through the other two lights?

• The lights will get brighter because the current increases through each light.

• The lights will get dimmer because the current decreases through each light.

• The lights will stay the same brightness because the current remains constant through each light.

• The lights will go out because the current is unable to flow through the broken/open circuit.

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When a balloon charged with static electricity is moved from one place to another, what type of force is generated? [hint: the negative charges and positive charges create a _____ field around the balloon]

• Gravitational

• Magnetic

• Mechanical

• Electric

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Three resistors of 12 ohms, 12 ohms, and 6 ohms are connected in parallel. The combination is

connected to a 12 V battery. What is the current through the 6 ohms resistor shown above? (total current divided by the 3 branches)

• 1A

• 2A

• 3A

• 4A