As the value of a variable resistor is increased, while voltage is held constant, the current flow in the resistor will
decrease
increase
remain the same
In electrolytes, the particles carrying the charge are
protons
neutrons
positive ions, only
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
0.50 A
2.0 A
15 A
50. A
If the length of a copper wire is reduced by half, then the resistance of the wire will be
halved
doubled
quartered
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
8 ohms
2 ohms
16 ohms
4 ohms
The electrical resistance of a metal wire could be decreased by
increasing its temperature
increasing its diameter
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
cross-sectional area
length
resistance
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
shortest and thickest
shortest and thinnest
longest and thickest
longest and thinnest
How much current flows through a 12-ohm flashlight bulb operating at 3.0 volts?