Current Voltage Power
Presentation
•
Physics
•
10th Grade
•
Practice Problem
•
Easy
Chethana Amarasinghe
Used 1+ times
FREE Resource
24 Slides • 15 Questions
1
Current Electricity
Chethana Amarasinghe
2
Atomic Structure
•Nucleus contains Protons and Neutrons.
•Protons have a positive charge.
•Nucleus is positively charged because it contains protons.
•Electrons are orbiting around the nucleus.
•Electrons are negatively charged
•An atom is neutral because it has equal number of protons and electrons.
3
Multiple Choice
These are the particles in the nucleus of an atom.
Electrons & Protons
Neutrons and Protons
Electrons and Neutrons
Positrons and Neutrons
4
Multiple Choice
This subatomic particle is negatively charged.
Electron
Proton
Neutron
Nucleus
5
Positive ions and Negative ions
When electrons are removed from the atom, it becomes positively charged.
When an atom gains electrons, it becomes negatively charged.
6
Charges
7
Battery
•At the negative terminal of the battery electrons get released due to a chemical reaction.
•At the positive terminal positive ions get created due to a chemical reaction.
8
What is happening inside a Battery?
9
Recharging a rechargeable battery..
10
How do electrons flow?
•Conductors have free electrons in them.
•If a battery is not connected, they move in random directions.
•When a battery is connected, battery pushes the electrons to one direction.
11
How do electrons flow?
12
Charge and Current
•Electrons are negatively charged particles and they carry energy from the battery through wires as electricity.
•Charge is measured in Coulombs (C).
•Electrons are so small and has a very small charge.
13
Charge of an electron
14
Electric Current
Electrical current is defined as the rate of flow of charges (electrons) through a conductor.
15
16
Multiple Choice
Unit of Charge is,
Amperes
Electrons
Coulombs
Volts
17
Multiple Choice
Unit of Current is,
Coulombs
Volts
Watts
Amperes
18
Multiple Choice
How much charge has moved if a current of 13 A flows for 10 s?
1.3 C
130 C
0.77 C
13 C
19
Multiple Choice
How much current flows when 10 C passes down a wire in 2 s?
5 A
0.2 A
20 A
10 A
20
Multiple Choice
A current of 1.5 A flows through a simple electrical circuit. How many coulombs of charge flow through a point in 60 seconds?
90 C
0.025 C
40 C
45 C
21
Multiple Choice
There is a current of 0.5 A through a light bulb. How much charge passes through the bulb in 4 hours?
2 C
28 800
120 C
7200 C
22
Multiple Choice
How long does it take for 64 C charge to pass through a cross-sectional area of a wire that carries a current of 72 A?
0.89 s
1.125 s
64 s
0.72 s
23
DC and AC Current
24
Direct Current
In a direct current, the flow of electrons is consistently in one direction around the circuit
Alternating Current
In an alternating current, the direction of electron flow continually reverses.
Mains electricity gives Alternating current.
A cell or a battery gives Direct current.
25
Measuring current
26
Voltage (V)
Cells or batteries move charges around circuits by transferring energy to the charges.
The amount of energy given to 1 C of charge is known as the voltage.
Unit of voltage= Volts (V)
27
A 6 V battery gives 6 J of energy to each Coulomb of charge that passes through the battery.
A 9 V battery gives 9 J of energy to each Coulomb of charge that passes through the battery.
Voltage is also known as potential difference.
28
29
Multiple Choice
What is the unit of Energy?
Watts
Joules
Volts
Coulombs
30
Multiple Choice
What is the potential difference between two points if 2 C of charge shifts 4 J?
0.5 V
8 V
2 V
4 V
31
Multiple Choice
How much energy is transferred when 3 C of charge moves through a potential difference of 6 V?
3 J
0.5 J
2 J
18 J
32
Electric Power
One watt is the power when one joule of energy is transferred in one second.
1 W=1 J/s
Power is the amount of energy transferred per second.
Power is measured in Watts (W).
33
34
Can you build up the connection ?
35
36
37
Multiple Choice
What is the power rating of an electric heater that draws a current of 12.5 A when plugged into the mains supply of 230 V?
2875 W
1840 W
4650 W
230 W
38
Open Ended
The electric power consumed by a circuit with one light bulb is 3 W. The voltage of the battery is 3 V. What is the current in the circuit?
39
Open Ended
The electric power consumed by a circuit with one light bulb is 6 W. The current in the circuit is 4 A. What is the voltage of the circuit?
Current Electricity
Chethana Amarasinghe
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