- #1
emmfranklin
- 7
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Homework Statement
This is a circuit i tried recently . I have recorded my observation below and i need to know why it happens like that
.....230 V
______________(~)______________
|...........|
|...........|
|...........|
|...62V...130V...38V...|
|...__(v)__...__(v)__...__(v)__...|
|..|...|...|...|...|...|...|
|..|...|...|...|...|...|...|
|_|__(x)__|___|__(x)__|____|__(x)__|__|
...A...B...C
...60W...40W...100W
Key: (x) = Bulb
(v) = voltmeter
(~) = AC Voltage
Please ignore the dotted lines ... .I did that because otherwise the whole diagram got crumpled up when i used spaces or tabspace to make my circuit diagram.
it is very difficult to draw a circuit diagram in ascii text.
please do not consider the dots as connecting wires.
the connecting wires are | and ___
I have connected 3 Tungsten Bulbs to an AC source of 230 voltage in series. Each glows differently.
Bulb A is 60Watts, B is 40Watts, C is 100Watts.
I noticed that Bulb B is the Brightest, Bulb A is dim and Bulb C is the dimmest. (least bright). I recorded the voltage across each using a multimeter and indicated in the diagram.
The voltages measured may be up or down by 2 to 3 volts due to practical errors.
Normally the 100 W is always the brightest when compared with other bulbs in a single circuit i.e bulb is connected alone to the power source.
Q1) Why does the 40 W bulb glow the brightest?
Q2) Why is the voltmeter showing the highest reading across the 40 W bulb B?
Q3) What is the resistance in each case?
Q4) What is the current drawn ? is it different in each bulb or same .
Q5) What is the Power in each?
Q6) What is the Energy used each?
Homework Equations
V= IR
P= IV