Current Electricity Review

A wire carries a current of 6.0 amperes. How much charge passes a point in the wire in 120 seconds?

• 6.0 C

• 20 C

• 360 C

• 720 C

A piece of wire has a resistance of 8 ohms. A second piece of wire of the same composition, diameter, and temperature, but one-half as long as the first wire, has a resistance of

• 8Ω

• 2Ω

• 16Ω

• 4Ω

As the temperature of a metallic conductor increases, its resistance usually

• decreases

• increases

• remains the same

Plastic insulation surrounds a wire having a diameter d and length l as shown in the associated diagram. A decrease in the resistance of the wire would be produced by an increase in the

• thickness of the plastic insulation

• length of the wire

• diameter d of the wire

• temperature of the wire

A 0.5 meter length of wire with a cross-sectional area of 3.14 x 10^-6 meters squared is found to have a resistance of 2.53 x 10^-3 ohms. According to the resistivity chart, the wire could be made of

• aluminum

• copper

• nichrome

• silver

Tags

NGSS.HS-PS3-5

In a flashlight, a battery provides a total of 3.0 volts to a bulb. If the flashlight bulb has an operating resistance of 5.0 ohms, the current through the bulb is

• 0.3 A

• 0.6 A

• 1.5 A

• 1.7 A

Which graph best represents a material behaving according to Ohm's law?

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• 
• 

Which circuit segment has an equivalent resistance of 6 ohms?

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When the circuit shown below is completed, what will be the reading on the ammeter at B?

• less than the reading at A

• greater than the reading at A

• the same as the reading at A

Three resistors of 20 ohms, 30 ohms, and 60 ohms, respectively, are connected in series with a battery. A current of 2.0 amperes will flow through this circuit when the potential difference of the battery is

• 10 V

• 20 V

• 110 V

• 220 V