Question paper ....25 Marks
Q1.State and explain with diagram resistors connected in i) series ii) parallel 5Marks
Q2. Write a major disadvantage of a series circuit from our daily life. 2 Marks
Q3. State and explain Joules heating law. And derive an expression for Joules heating law. 5 Marks
Q4. Name five electrical devices working on Joules heating. 2 Marks Q5. Explain how an electric bulb is producing light. Why Tungsten filaments are used in the bulb? 3 Marks
Q6. Explain fuse in electric circuits 3 Marks
Q7. Define : unit of power 2 Marks
Q8. Define: one watt hour 2 Marks Q9.
How many Joules of energy are there in 1KWh ? 1 mark
Answers
9ans ...
Answer:
1ans. What would you like to ask?
12th
Physics
Current Electricity
Equivalent Resistance in Series-Parallel
Draw circuit diagram of thr...
PHYSICS
Draw circuit diagram of three resistances connected in series combination. Derive formula for equivalent resistance for this combination.
EASY
Share
Study later
VIDEO EXPLANATION
ANSWER
The diagram of three resistors connected in series combination is shown.
R
1
,R
2
and R
3
are the three resistors.
I = electric current flowing through the circuit
V = the potential difference supplied by the battery
Applying the Ohm’s law to the entire circuit, we have
V=IR
On applying Ohm’s law to the three resistors separately, we further have
V
1
=IR
1
V
2
=IR
2
and V
3
=IR
3
The total potential difference across a combination of resistors in series is equal to the sum of potential difference across the individual resistors. That is,
V=V
1
+V
2
+V
3
Therefore, IR=IR
1
+IR
2
+IR
3
or
Equivalent resistance of the combination, R=R
1
+R
2
+R
3
2ans....Advantages and Disadvantages of Series and Parallel Circuits.
Series Circuit. ...
Parallel Circuit. ...
Series Circuit.
Resistance (reduction of electrical current) adds up, draws less current = battery (power source) lasts longer. ...
Series Circuit.
One bulb (load) fuses, circuit incomplete (open or broken) ...
Similarities.
3ans Heat produced is
(II) Directly proportional to the resistance of given circuit. (III) Directly proportional to the time for which the resistance flows through the resistor. let us consider a resistance R , in which I amount of current flows. Work must be done by current to move continuously.
4ans..
A device which works on Joule's law of heating ;
Electric bulb
Electric heater
Electric iron
All the devices which work on Joule's law of heating.
5ans.Incandescent bulbs typically use a tungsten filament because of tungsten's high melting point. A tungsten filament inside a light bulb can reach temperatures as high as 4,500 degrees Fahrenheit. ... Without this glass covering and the vacuum it helps create, the filament would overheat and oxidize in a matter or moments.
6ans In electronics and electrical engineering, a fuse is an electrical safety device that operates to provide overcurrent protection of an electrical circuit. Its essential component is a metal wire or strip that melts when too much current flows through it, thereby stopping or interrupting the current
7ans..In the International System of Units, the unit of power is the watt, equal to one joule per second. ... The rate at which a light bulb converts electrical energy into light and heat is measured in watts – the electrical energy used per unit of time..
8ans.A watt-hour is the amount of energy needed by a device which uses one watt and is operated for one hour. Electricity is usually purchased by the kilowatt hour, and measured by the watt-hour mete
Explanation:
i think this will be too helpful ...
