Electricity Test

How much work is done in moving 5.0 coulombs of charge against a potential difference of 12 volts?

• 2.4 J

• 12 J

• 60 J

• 30 J

A device operating at a potential difference of 1.5 volts draws a current of 0.20 ampere. How much energy is used by the device in 60. seconds?

• 4.5 J

• 18 J

• 12 J

• 8.0 J

Tags

NGSS.HS-PS3-1

What is the current in an electric circuit if 10. coulombs of charge are transferred through the circuit in 5.0 seconds?

• 50 A

• 15 A

• 2.0 A

• 0..50 A

A wire carries a current of 2.0 amperes. How many electrons pass a given point in this wire in 1.0 second?

• 2 x 10¹⁹

• 2 x 10¹⁸

• 1.3 x 10¹⁸

• 1.3 x 10¹⁹

A complete circuit is left on for several minutes, causing the connecting copper wire to become hot. As the temperature of the wire increases, the electrical resistance of the wire

• remains the same

• decreases

• increases

A manufacturer recommends that the longer the extension cord used with an electric drill, the thicker (heavier gauge) the extension cord should be. This recommendation is made because the resistance of a wire varies

• inversely with both length and cross-sectional area

• directly with both length and cross-sectional area

• directly with length and inversely with cross-sectional area

• inversely with length and directly with cross-sectional area

A 0.500-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

• copper

• nichrome

• silver

• aluminum

What must be inserted between points A and B to establish a steady electric current in the incomplete circuit represented in the diagram above?

• magnetic field source

• voltmeter

• switch

• source of potential difference

A 6.0-ohm resistor that obeys Ohm's Law is connected to a source of variable potential difference. When the applied voltage is decreased from 12 V to 6.0 V, the current passing through the resistor

• is quadrupled

• is doubled

• is halved

• remains the same

In a simple electric circuit, a 110-volt electric heater draws 2.0 amperes of current. The resistance of the heater is

• 220 ohms

• 28 ohms

• 55 ohms

• 0.018 ohms