Part Six - Voltage, Current and Resistance

Question 1

A point in the electric field of two opposite charges, d1=300 cm, d2=400 cm. Q1=4 nC and Q2=-3 nC. Find the Electric Field strength.

Answer 1

1.748 N/C

Question 2

Electrons, when flowing in a circuit, move from the ________ terminal to the _________ terminal.

Answer 2

Negative; Positive

Question 3

In a circuit, if resistance increases, what happens to current?

Answer 3

It decreases

Question 4

If energy cannot be created or destroyed, then when we talk about energy consumption, what are we really talking about?

Answer 4

Energy from electricity is transferred or converted to a new form of energy like light or sound or heat.

Question 5

What does it mean for something to be a “good conductor” of electricity?

Answer 5

Electrons/electricity do move through the material easily.

Question 6

What does it mean for something to be a “good insulator” of electricity?

Answer 6

Electrons/electricity don’t move through the material easily.

Question 7

Which of the following materials are good conductors of electricity?

Answer 7

Copper, silver, metals or water

Question 8

Which of the following materials are bad conductors (insulators) of electricity?

Answer 8

Glass, wood, rubber or plastic

Question 9

A voltmeter reading across a component in a circuit that has a resistance of 2 Ω is 6 V. What is the current?

Answer 9

3 A

Question 10

You have a resistor with a current of 0.01 A, and 5 V across. What will the current be if the voltage across is 7.5 V?

Answer 10

0.015 A

Question 11

A circuit has an ammeter reading of 10 A, and total resistance of 20 Ω, what is the voltage of the power supply?

Answer 11

200 V

Question 12

A circuit’s power supply has 180 V, and the ammeter reading for the circuit is 60 A, what is the circuit’s resistance?

Answer 12

3 Ω

Question 13

A voltage of 120 V is applied to a 60 W light bulb. How much current is in the bulb?

Answer 13

0.5 A

Question 14

A light bulb has 0.25 A of current using a voltage of 120 V. What is the power rating for this bulb?

Answer 14

30 W

Question 15

What is the resistance of an object if a voltage of 20 V produces a current of 5 A?

Answer 15

4 Ω

Question 16

What is the current produced when a voltage of 30 V is applied to an object with a resistance of 6 Ω?

Answer 16

5 Ω

Question 17

What are the essential parts of a battery?

Answer 17

Electrodes and electrolyte

Question 18

What chemical reactions occur that allow a battery to work?

Answer 18

Oxidation and reduction

Question 19

Which way do the electrons flow from and towards a battery in a completed circuit?

Answer 19

From the negative electrode to the positive electrode

Question 20

What are the two types of batteries?

Answer 20

Wet and dry