Current, Resistance, and Electromagnetic force (Q3 W2)

As you know, when we bring a positive test charge closer to a point charge they repel, and to bring them even closer we need energy to overcome that repulsive force, but do you know what we call that energy?

• Electric potential energy

• Electrostatic energy

• Electromagnetic energy

A point charge is any charge that has an electric field that can be found at a particular distance(point).

• True

• False

A point charge is any positive charge that has an electric field.

• True

• False

A source charge is basically just an electric charge that produces an electric field.

• Fact

• Bluff

A source charge is just a charge that can be found at a particular distance.

• Fact

• Bluff

As you know these are variables to remember when solving for U, but do you still know the formula?

• U = k q1q2/r

• U = k/q1q2r

• U = q1q2r/k

• U = kr²/q1q2

As you know these are variables to remember when solving for V, but do you still know the formula?

• V = k Q/r

• U = kr²Q³

• U = Qr/k

• U = k r/Q²

What is an electric current?

• Direction of flow of current

• Rate of charge movement

• Measure of opposition to the current flow

What is resistance?

• Direction of flow of current

• Rate of charge movement

• Measure of opposition to the current flow

This exist when there's a net movement of electric charge through a medium.

• Current

• Resistance

• Electricity