Electric Current

Question 1

What is ultimately responsible for electric shock, a high current or a high voltage?

Answer 1

High current

Question 2

What happens to the current in a circuit when you add a resistor?

Answer 2

The current stops or slows down

Question 3

What happens to the brightness of light bulb, if you add another lightbulb in series?

Answer 3

Then light bulbs light will dim

Question 4

What happens to the current through a light bulb, if you add another lightbulb in series?

Answer 4

It share the current with the other bulb.

Question 5

What happens to the brightness of light bulb, if you add another lightbulb in parallel?

Answer 5

The brightness stays the same

Question 6

What happens to the current through a light bulb, if you add another lightbulb in parallel?

Answer 6

The bulbs will each have their own current

Question 7

What causes a material to be “magnetic”?

Answer 7

If a large percentage of atoms which it is comprised.

Question 8

What is electric potential energy?

Answer 8

Energy possessed by electric charges by virtue of their position an electrostatic field

Question 9

What is the SI unit of electrical potential energy?

Answer 9

Johle

Question 10

What is electric potential?

Answer 10

The difference in electrical charge between two points in a circuit expressed in volts

Question 11

What is the SI unit of electric potential?

Answer 11

Voltage

Question 12

What is electric current?

Answer 12

Rate at which charges pass a given point

Question 13

What is the SI unit of electric current?

Answer 13

Ampere

Question 14

What is electrical resistance?

Answer 14

The opposition to the flow of electric change

Question 15

What is the SI unit for electrical resistance?

Answer 15

Ohm(Ω)

Question 16

What is the difference between alternating current and direct current?

Answer 16

AC is current that changes direction charges oscillate back and forth

Question 17

Which has more resistance a thick wire or a thin wire?

Answer 17

Thin wire

Question 18

Which has more resistance a long wire or a short wire?

Answer 18

Long wire

Question 19

Calculate the current through a wire with a 50 V potential difference and a 10 Ω resistance.

Answer 19

I=V/I=50V/10Ω=5 V/Ω or 5A

Question 20

Calculate the resistance of a wire with a 100V potential difference and a 20A current.

Answer 20

R=V/I=100V/20A=5 V/A or 5Ω

Question 21

Calculate the voltage across a wire with a 40 A current and a 5 Ω resistance.

Answer 21

V=IR=40A5Ω=200V

Question 22

What kind of electricity is caused by friction?

Answer 22

Static Electricity is caused by friction.

Question 23

How are charged particles in matter affected when two objects are rubbed together?

Answer 23

All matter is made up of tiny particles that have electric charges. Some of these particles have a positive charge. Other particles have a negative charge. Rubbing two objects together may cause some of the negative charges to rub off one object. The charges move to the second object. This gives the second object a greater negative charge than the first object.

Question 24

How is current electricity produced?

Answer 24

Current electricity is produced when negative charges move along a path.

Question 25

What is a circuit? What are the parts of a circuit?

Answer 25

A circuit is the path along which negative charges move.

There are four parts to a circuit:

(1) There is a source of electricity Example: A battery
(2) There is a path along which charges can move. Example: A wire
(3) There is a switch that opens and closes the circuit. Example: A knife switch
(4) There is some object that uses the electricity. Example: A light bulb

Question 26

Explain the difference between a complete circuit and an incomplete circuit.

Answer 26

When a switch is closed or turned on, the path of electricity is complete. The charges move. A circuit whose path is complete is called a complete circuit. When the switch is open, or turned off, the path is broken. The movement of charges stops. The path is incomplete. A circuit whose path is incomplete is called an incomplete circuit.