pre test

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• 2

• 1/4

• 4

• 1/2

• 2

• 1/4

• 4

Capacitor is a device used to__________

• store electrical energy

• vary the resistance

• store magnetic energy

• dissipate energy

The capacitance between two plates increases with

• Shorter plate area and higher applied voltage

• Shorter play area and shorter distance between them

• Larger plate area, longer distance between plates and higher applied voltage

• Larger plate area and shorter distance between plates

In a variable capacitor, capacitance can be varied by ______

• Turning the rotatable plates in or out

• Sliding the rotatable plates

• Changing the plates

• Changing the material of plates

What is the color for the numerical value of 2 on a resistor?

• brown

• black

• orange

• red

What are the color codes for a 470k ohm resistor?

• Yellow, Violet, Yellow
• Orange, Grey, Orange
• Yellow, Violet, Orange
• Orange, Grey, Yellow

Which resistor will prevent the most current flow?

• 1 ohm
• 100 ohms
• 1000 ohms
• 0.5k ohms

What are rheostats used for?

• Control large amounts of heat
• Vary large amounts of current
• Control of a circuit's power rating
• Vary a circuit's tolerance

Electromagnetic induction is change in ___________________. 

• surface area
• magnetic poles
• magnetic flux