# Telangana SCERT Class 10 Physical Science Chapter 9 Electric Current Solution

Telangana SCERT Class 10 Physical Science Chapter 9 Solution – Electric Current. Here in this post we provides Class 10 Physical Science Electric Current Telangana State Board Solution. Telangana State Board English Class X Medium Students can download this Solution to Solve out Improve Your Learning Questions and Answers.

## Telangana State Board Class 10 Physical Science Chapter 9 Electric Current Solution:

### Electric Current

Exercise: –

Reflection on concept.

1) Explain how electron flow causes electric current with Lorentz – Drude theory of electrons. (AS1)

Ans: – The Lorentz Drude theory described the concept that there present free electron in a metal. As the positive charge electron are fixed in their position and the negative charge particle for this position removing them. The closed circuit helps us to measure the flow of the current but the open circuit doesn’t do that.

2) Write the difference between potential difference and emf.

Ans: – The difference between two-point charges which create the forces by which an electron flow from the higher potential to lower this is called the potential difference. In an electro chemical shell the negatively charge particle from anode to positively charge particle to cathode by some work done which is an emf.

3) How can you verify that the resistance of a conductor is temperature dependent? (AS1)

Ans: – After taking an electric bulb then switch on then measure the resistance of the bulb in some time the conductor heated up then we measure the resistance. In the second case resistance is high so the resistance of a conductor will be temperature dependent as well.

4) Explain how electric shock takes place.

Ans: – There is a tendency of current that it always tries to flow from higher to lower potential. If we touch any electric wire then it gets a passage for passing of the current through our body as there is no uniform resistance in our body. The by this activity we felt shock.

5) Draw a circuit diagram for a circuit in which two resistors A and B are connected in series with a battery and a voltmeter is connected to measure the potential difference across the resistor A. 6) In the figure Q-6 the potential at A is ————— when the potential at B is zero. (AS7)

Ans: – Application of Concepts

Ans: – In the surrounding of us there are many compliance are connected to a single meter in home so large electric current needed for this electrical equipment.By this excessive pressure by default when the fire broke out in the wire this situation is known as overloading.

2) Why do we use fuses in household circuits? (AS1)

Ans: – If anywhere is huge demand of current in house,then we see that overloading happen. For the protection of the different appliances, we use a circuit which made up with thin wire as well as low melting point. If there are any excess current passes through it blows off by this it cut the connection to main source and save the appliances.

3) Two bulbs have ratings 100 W, 220V and 60 W, 220 V. Which one has the greaterresistance?

Ans: – We know that,

P=V^2/R

or R=V^2/P.

By applying the upper formula, we calculate that the second bulb has more resistance. (R1=220^2/100=484ohm and R2= 220^2/100=806.66ohm)

4) Why do we consider tungsten as a suitable material for making the filament of a bulb? (AS2)

Ans: – Tungsten’s materialuses for the making the filament because of it has high resistance and high melting point. This property of tungsten gave the advantage and by this that tungsten doesn’t heat up easily.

5) Are the head lights of a car connected in series or parallel? Why? (AS2)

Ans: – The lights in car are connected in parallel for all the electrical equipment must goes on.

6) Why should we connect electric appliances in parallel in a household circuit? What happens if they are connected in series? (AS2)

Ans: – In our household we connected all the appliances in parallel as if by chance any one gets default then other should be going on properly.

7) If the resistance of your body is 100000Ω. What would be the current that flows in your body when you touch the terminals of a 12V battery? (AS7)

Ans: – Ohms law say that V=lR.

Here get V=12v and R= 100000ohm;

So, I=V/R

= 12/100000

= 0.00012ohm.

Higher Order Thinking Questions

1) Imagine that you have three resistors of 30Ω each. How many resultant resistances can be obtained by connecting these three in different ways? Draw the relevant diagrams.

Ans: – 2) A house has 3 tube lights, two fans and a Television. Each tube light draws 40W. The fan draws 80W and the Television draws 60W. On the average, all the tube lights are kept on for five hours, two fans for 12 hours and the television for five hours every day. Find the cost of electric energy used in 30 days at the r ate of Rs. 3.00 per Kwh. (AS7)

Ans: – One tube consumed 40W then 3 tube consumed total power in five hours is (5×40×3=600wh). One fan consumed 80W then 2 fan consumed total power in 12 hours is (2×12×80=1920wh). Total power consumed by the television in 5 hr is (1×5×60= 300wh) Then the total energy consumed by all appliances will be,

(600+1920+ 300=2820wh.

Or, 2.820kwh.

At the end of 30 days total energy for 3 rupee per day is (2.820×3×30=253.60) Rs.

MULTIPLE CHOICE QUESTIONS.

1.) A uniform wire of resistance 50 Ω is cut into five equal parts. These parts are now connected in parallel. Then the equivalent resistance of the combination is

a) 2 Ω b) 10 Ω c) 250 Ω d) 6250 Ω

Ans: – option (a)2.

2.) A charge is moved from a point A to a point B. The work done to move unit charge during this process is called.

a) potential at A b) potential at B

c) potential difference between A and B d) current from A to B.

Ans: – option (c).

3.) Joule/ coulomb is the same as

a) 1 watt b) 1 volt

c) 1 ampere d) 1 ohm.

Ans: – option (a).

4.) The resistors of values 2 Ω, 4 Ω, 6 Ω are connected in series. The equivalent resistance in the circuit is

a) 2 Ω b) 4 Ω

c) 12 Ω d) 6 Ω.

Ans: – option (c).

5.) The resistors of values 3 Ω, 6 Ω, 18 Ω are connected in parallel. The equivalent resistance in the circuit is

a) 12 Ω b) 36 Ω

c) 18 Ω d) 1.8 Ω.

Ans: – option (d)

6.) The resistors of values 6 Ω, 6 Ω are connected in series and 12 Ω are connected in parallelthe equivalent resistance of the circuit is

a) 24 Ω b) 6 Ω

c) 18 Ω d) 2.4 Ω.

Ans: – option(b).

7.) The current in the wire depends

a) only on the potential difference applied

b) only on the resistance of the wire

c) on both of them d) none of them.

Ans: – option (c).

Updated: January 19, 2022 — 3:11 pm