[ad_1]

The video explains the difference between a chemical cell and a battery. It shows how cells can be arranged to form a battery of cells in series or a battery of cells in parallel. It also shows how the total voltage supplied by a battery of cells in series or parallel can be calculated, given the voltage of an individual cell.

http://www.BCLearningNetwork.com.

0:00we’ll look at the difference between a

0:03cell and a battery when most of us see a

0:06device like this we call it a battery

0:09technically it’s not really called a

0:12battery it’s called a chemical sell the

0:16battery is actually defined as a

0:18combination of two or more chemical

0:20cells connected to each other for

0:23example if we attach the positive end of

0:25one cell to the negative end of another

0:27cell like this it forms a battery of two

0:32cells in series adding another cell like

0:35this

0:37will give us a battery of three cells in

0:40series

0:41the voltage of a cell is a measure of

0:43how much potential energy electrons gain

0:46as they go through a cell

0:49many common cells have a voltage of 1.5

0:52volt

0:54when cells are connected in series or

0:56positive to negative each sell ads

0:59potential energy to the electrons going

1:02through it

1:04so they’re voltages add up if a single

1:07cell has a voltage of 1.5 bolts

1:10two cells in series will have a total

1:13voltage of three volts

1:15to understand how this works we imagine

1:18one electron going through one cell

1:24as it goes through it picks up 1.5 volts

1:27of potential energy and goes into the

1:29other cell

1:31we’re the same electron picks up another

1:331.5 volts of potential energy

1:37so this single electron has picked up

1:391.5 volt potential energy from both of

1:43the cells

1:45so it is picked up a total of 1.5 plus

1:471.5 which is three bolts of potential

1:51energy

1:53therefore the voltage on the voltmeter

1:54is 3 volts

1:583 1.5 volt cells in series will have a

2:01total voltage a 1.5 plus 1.5 plus 1.5 or

2:09three times 1.5 which is equal to 4.5

2:12bolt

2:16look at a different arrangement when two

2:19cells are brought together

2:21so that their positive ends in line and

2:24there- and the line

2:27and the two positive and are connected

2:29by a conductor

2:31and the two negative ends are connected

2:33by a conductor

2:35they form a battery of two cells in

2:38parallel

2:40in parallel voltages do not add up

2:44for example if the voltage of oneself is

2:471.5 bolts

2:49and we add another cell and parallel

2:52the voltage will still be 1.5 volt

2:58even adding a third cell in parallel

3:00will still give us a voltage of 1.5

3:03volts

3:05to understand why this happens we

3:07consider two cells in parallel and two

3:10electrons by the voltmeter one of the

3:13electrons goes through oneself

3:16and picks up one point viable to

3:18potential energy

3:20and the other electron goes through the

3:23other cell

3:24and picks up 1.5 volts of potential

3:27energy

3:29so each electron has picked up potential

3:32energy from only one of the cells

3:35neither of the electrons go through both

3:38of the cells

3:41voltage is a measure of potential energy

3:43per electron

3:45each electron is picked up only 1.5

3:49volts

3:50so the voltage is still 1.5 volt

3:54to review a single unit like this is

3:57called the chemical cell rather than a

4:00battery

4:01when cells are connected with positive

4:03to negative a form of battery of cells

4:06in series

4:07when cells are connected in series their

4:10voltages add up

4:12so for example the total voltage of 3

4:141.5 volt cells in series is equal to 1.5

4:18plus 1.5 plus 1.5

4:21which is 4.5 bolts when cells are

4:25arranged so they’re positive terminals

4:28are connected to a conductor and all

4:30their negative terminals are connected

4:32to another conductor a form a battery of

4:35cells in parallel and when cells of

4:39equal voltage are arranged in parallel

4:42the total voltage of the battery is

4:45saying as a voltage of a single cell

[ad_2]

WCLN – Cells and Batteries – Chemistry

#WCLN #Cells #Batteries #Chemistry