Wiring Lesson Day 2

10
1 | Page Wiring lesson 2: Staircase and hospital wiring. Aim: To understand staircase and hospital wiring Objective: To build a staircase and hospital circuit. rotons have a _______ charge. he flow of electrons is called the ________. or electricity to flow, there has to be something to push the electrons along. This is called the ________________ and it is measured in _______. etals have a ________resistance as they give up their electrons very easily. ower=work done and power is measured in __________. Watts = amps X _______ ork done in a period of time is measured in kilowatt hours (Kwh), Kwh= time X ________ he reluctance to give away electrons is called ________ he _____wire is always red When we connect two wires together we must wrap the connection in _________. Open PPT called ‘ 7. Ohms Law’ Here is a short recap on what we learnt yesterday, fill in the gaps:

description

This document explains about practical training on wiring for day 2 OER

Transcript of Wiring Lesson Day 2

Page 1: Wiring Lesson Day 2

1 | P a g e

Wiring lesson 2: Staircase and hospital wiring.

Aim: To understand staircase and hospital wiring

Objective: To build a staircase and hospital circuit.

rotons have a _______ charge. he flow of electrons is called the ________. or electricity to flow, there has to be something to push the electrons along. This is called the ________________ and it is measured in _______. etals have a ________resistance as they give up their electrons very easily. ower=work done and power is measured in __________. Watts = amps X _______ ork done in a period of time is measured in kilowatt hours (Kwh), Kwh= time X ________ he reluctance to give away electrons is called ________ he _____wire is always red When we connect two wires together we must wrap the connection in _________.

Open PPT called ‘ 7. Ohms Law’

Here is a short recap on what we learnt yesterday, fill in the gaps:

Page 2: Wiring Lesson Day 2

2 | P a g e

Staircase wiring.

This type of wiring is very useful as it allows us to switch on/off an electrical device from two different places. This means that we don’t have to return to the same place we turned the device on to turn if off again. It is called staircase wiring as it is often used on staircases to turn a light on and off. For example using this wiring technique we can turn the light in at place A and then turn it off again at place B.

We can also then turn it on again in place B and off in place A:

Staircase wiring requires a two-way switch. Yesterday we used a one-way switch which looks like this:

Here is a two-way switch:

Front Back

Page 3: Wiring Lesson Day 2

3 | P a g e

As you can see a two-way switch has 3 screws to connect wires to rather than just 2.

The symbol for a two-way switch is:

Discuss with a friend where staircase wiring could be used, other than on a staircase. For instance it could be used along a long corridor in a hotel.

Activity 1: Build a staircase circuit:

Equipment:

ire cutters olour coded wire two-way switches bulb baton crew driver nsulator tape ire strippers ower Supply and plug

Step1: draw a staircase circuit that uses 2 two-way switches to turn a lamp on/off. Think about how you will need to connect the wires to the two-way switches in order for them both to be able to switch the lamp on and off.

Page 4: Wiring Lesson Day 2

4 | P a g e

What is wrong with these circuits?

How many live and neutral wires will we need to make this circuit?

Step 2: Connect a live wire to power supply to the 1st two-way switch using the same method we learnt yesterday (remember that the live wire must connect to the live wire of the power supply and not the neutral one). Connect this wire to the middle screw on the switch.

Step 3: connect a second live wire from the baton to the middle screw of the 2nd two-way switch

If your diagram looks like this one then you’ve done it correctly, well done!

Page 5: Wiring Lesson Day 2

5 | P a g e

.

Step 4: connect a third live wire from the top screw of the 1st two-way switch to the top screw of the 2nd two-way switch.

Step 5: connect a fourth live wire from the bottom screw of the 1st two-way switch to the bottom screw of the 2nd two-way switch

Step 6: connect a neutral wire from the baton to the power supply. Your circuit should now look like this:

Page 6: Wiring Lesson Day 2

6 | P a g e

Step 7: Put a bulb into the baton.

Click for Video of two way Switch

Power supply

1st two-way switch 2nd two-way switch

Baton

Now turn the power supply on and see if you can turn the lamp on using the 1st switch and off again using the 2nd. Then try turning it on with the 2nd switch and off with the 1st. If this doesn’t work re-read the check whether you have connected the wires to the correct places, if you think all the wiring is correct then try putting a different bulb in the baton.

Page 7: Wiring Lesson Day 2

7 | P a g e

Hospital wiring:

Hospital wiring allows us to swap between series and parallel circuits. We wire the circuit in such a way that by turning on/off certain switches we put the circuit into parallel or series flow. To do this we use a one-way switch and a two-way switch.

Discuss with a friend what you think this circuit will look like and draw out your diagram.

Activity 1: Build a hospital circuit:

Equipment:

ire cutters olour coded wire two-way switches one-way swotch bulbs batons crew driver nsulator tape ire strippers ower Supply and plug

Step 1: Does your circuit diagram look like this one? If it does then well done! If not then label your mistakes in your diagram and draw this new one next to it.

Page 8: Wiring Lesson Day 2

8 | P a g e

Step 2: Connect a live wire to power supply to the top screw on the two-way switch using the same method as earlier (remember that the live wire must connect to the live wire of the power supply and not the neutral one).

Step 3: connect a second live wire from the top screw of the two-way switch to the 1st baton.

Step 4: connect a third live wire from the bottom screw of the one-way switch to the middle screw of the 2nd two-way switch.

Step 5: connect a neutral wire from the 1st baton to the 2nd baton.

Step 6: connect a second neutral wire from this same screw on the 2nd baton to the top screw of the one-way switch

Step 7 : connect a third neutral wire from the second screw on the 2nd baton to the bottom screw of the two-way switch

Step 8: connect a fourth neutral wire from this same bottom screw on the two-way switch to the power supply (remember that the neutral wire must connect to the neutral wire of the power supply and not the live one).

Page 9: Wiring Lesson Day 2

9 | P a g e

Your circuit should look like this from the back:

Using your experience of wiring and your knowledge of parallel and series circuits, explain whether the bulbs in each of these photographs are in series or parallel circuits:

Also explain which switch needs to be turned on/off in order to put the circuit in this form.

1st baton

2nd baton

Two-way switch

One-way

Page 10: Wiring Lesson Day 2

10 | P a g e

Click For video link

1

2

3

4