Current and Resistance

The sphere of a Van de Graaff generator had 6.00 C of charge. When connected to the ground, it was discharged in 24.0 ms. What was the average discharge current?  $I=∆Q/∆t$  

• 240 A

• 250 A

• 260 A

• 270 A

Tags

NGSS.HS-PS2-5

A battery supplies a 0.015 A current to a small radio. How long should the radio stay on so that 4.80 C passes through each of the following parts of the circuit through the battery  $I=∆Q/∆t$  

• 300 s

• 310 s

• 320 s

• 330 s

An electrical device of 37.2 W resistance performs best when the current is 3.62 A. How much voltage should be applied? $∆V=R×I$  

• 131.66 V

• 132.66 V

• 133.66 V

• 134.66 V

Electric current in a wire is the

• number of electric charges moving from one location to another in the wire.

• net movement of electrical energy through the wire.

• rate at which electric charges move through an area of the wire.

• rate at which electrical energy is used to move charges through the wire.

One ampere of current is the movement of ______________ through a given area in one second.

• one coulomb of charge

• one volt of potential difference

• one joule of energy

• one electron

The diagram above represents a wire in which the net flow of electrons is to the right. The direction of the conventional current in the wire

• depends on the potential difference.

• is to the left.

• is the same direction as the electron flow.

• cannot be determined.

The speed at which an electron moves in an electric field in a conductor is the

• speed of light.

• average collision speed.

• drift velocity.

• average electron speed.

When a current moves through a copper conductor, electrons collide with copper atoms. The result of these collisions is

• an increase in voltage.

• a decrease in resistance.

• an increase in temperature.

• a decrease in voltage.

What is the potential difference across a 10 ohm resistor if the current in the resistor is 3.0 A?   $\Delta V=R\times I$          

• 0.3 V

• 3 V

• 30 V

• 15 A

The current of a non-ohmic material is plotted against the applied potential. How would you describe the resulting graph?

• The graph will have a constant positive slope.

• The graph will have a variable positive slope.

• The graph will have a variable negative slope.

• The graph will have a constant negative slope.