Unit Test

Question 1

Charges of +3 µC and –5 µC are 2 mm from each other. The –5 µC charge is replaced with a +5 µC charge.

Revolt · Accepted Answer

A: same force, but in the opposite direction

Question 2

This circuit diagram lacks a basic feature of a circuit.

Revolt · Accepted Answer

D: a device that uses energy

Question 3

A 40 W bulb is left on from 9:00 p.m. to 6:30 a.m.

Revolt · Accepted Answer

B: 0.38 kWh

Question 4

What is the current in a circuit with a 9.0 V battery and a resistance of 36.0 Ω?

Revolt · Accepted Answer

A: 0.25 A

Question 5

A point charge is used to determine the electric field around a charged particle. Why is it necessary that the point charge does not affect the position of the charge being tested?

Revolt · Accepted Answer

C: Electric fields are inversely proportional to the square of the distance, so any change in position changes the field.

Question 6

What are used to transfer electrical energy from a power plant all the way to a home?

Revolt · Accepted Answer

D: power lines

Question 7

How do electric field lines indicate the strength of the field?

Revolt · Accepted Answer

B: by how close the lines are

Question 8

The table lists the time it takes for an amount of charge to pass through a point in a wire. Janelle is exploring the relationship between the brightness of a light bulb and the current that powers it. When applying these currents to the same bulb, the bulb is brighter when the current is greater.Which lists the currents in the order of the bulb brightness they cause from most bright to least bright?

Revolt · Accepted Answer

B: Y, W, Z, X

Question 9

A gas water heater is 75% efficient. The energy output used to heat the water is 4.6 kWh.

Revolt · Accepted Answer

C: 6.1 kWh

Question 10

Which principle states that the net electrical force on a specific charge is equal to the sum of the vector components of the charges applying forces on it?

Revolt · Accepted Answer

C: superposition principle

Unit Test Answers

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