As the value of a variable resistor is increased, while voltage is held constant, the current flow in the resistor will

1.   ?    decrease
2.   ?    increase
3.   ?    remain the same

In electrolytes, the particles carrying the charge are

1.   ?    protons
2.   ?    neutrons
3.   ?    positive ions, only
4.   ?    positive and negative ions

If 10. coulombs of charge are transferred through an electric circuit in 5.0 seconds, then the current in the circuit is

1.   ?    0.50 A
2.   ?    2.0 A
3.   ?    15 A
4.   ?    50. A

If the length of a copper wire is reduced by half, then the resistance of the wire will be

1.   ?    halved
2.   ?    doubled
3.   ?    quartered
4.   ?    quadrupled

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

1.   ?    8 ohms
2.   ?    2 ohms
3.   ?    16 ohms
4.   ?    4 ohms

The electrical resistance of a metal wire could be decreased by

1.   ?    increasing its temperature
2.   ?    increasing its diameter
3.   ?    increasing its length

A copper wire is connected across a constant voltage source. The current flowing in the wire can be increased by increasing the wire's

1.   ?    cross-sectional area
2.   ?    length
3.   ?    resistance
4.   ?    temperature

A student needs to increase the resistance in a circuit. All that is available for this task is a wide variety of wires of different lengths and thickness. To obtain the maximum resistance, the student should replace the wire with one that is

1.   ?    shortest and thickest
2.   ?    shortest and thinnest
3.   ?    longest and thickest
4.   ?    longest and thinnest

How much current flows through a 12-ohm flashlight bulb operating at 3.0 volts?

1.   ?    0.25 A
2.   ?    0.75 A
3.   ?    3.0 A
4.   ?    4.0 A