Advertisements
Advertisements
Question
Match the pairs.
| ‘A’ Group | ‘B’ Group |
| 1. Free electrons | a. V/R |
| 2. Current | b. Increases the resistance in the circuit |
| 3. Resistivity | c. Weakly attached |
| 4. Resistances in series | d. VA/LI |
Advertisements
Solution
| ‘A’ Group | Answer |
| 1. Free electrons | c. Weakly attached |
| 2. Current | a. V/R |
| 3. Resistivity | d. VA/LI |
| 4. Resistances in series | b. Increases the resistance in the circuit |
APPEARS IN
RELATED QUESTIONS
Three 2 V cells are connected in series and used as a battery in a circuit.
What is the p.d. at the terminals of the battery?
In which direction do electrons flow?
Which unit could be used to measure current?
(a) Watt
(b) Coulomb
(c) Volt
(d) Ampere
You can given one hundred 1 Ω resistors. What is the smallest and largest resistance you can make in a circuit using these?
If you were going to connect two light bulbs to one battery, would you use a series or a parallel arrangement? Why? Which arrangement takes more current from the battery?
A cell supplies a current of 1.2 A through two 2 Ω resistors connected in parallel. When the resistors are connected in series, it supplies a current of 0.4 A. Calculate:
(i) the internal resistance and (ii) e.m.f. of the cell.
Tick(✓) the correct choice in the following:
When the length of a conductor is doubled the resistance of the conductor
will
Two cells each having an e.m.f. of 2 V and an internal resistance of 2Ω are
connected (a) In series, and ( b) In para 1le l as shown in fig. . What is the
current flowing through the cir cu it in each_ case?
The following appliances are to be used on 240 V supply. Calculate the current used by each and say which fuse, 2 amp, 5 amp or 13 amp should be incorporated with each, (i) A television rated at 150 W, (ii) An electric iron rated at 750 W, (iii) An immersion heater rated at 3000 W, (iv) A hair dryer rated at 500 W. How much will it cost to run the television set for 100 days for an average of 4 hours a day at 60 paise per unit?
The circuit diagram in fig shows two coils of an insulated copper wire wound on a cardboard tube. G is a center zero galvanometer.
(a) Describe what will happen when th e swi tch K is cl osed for severa l
seconds and then opened again .
(b) What will be the effect of repeating the experiment with an iron placed in the tube?
Tick (✓) the correct choice among the following :
In fig .XY is at right angles to the magnetic field. The direction in
which XY should be moved to induce an electron flow in the direction Y to X as indicated by the arrow is
An electric bulb is rated at 220 V, 100 W.
- What is its resistance?
- What safe current can be passed through it?
State whether the following statement is True or False:
The SI unit of charge is the coulomb.
In current electricity, a positive charge refers to ______.
The power of an electric device is a product of ______ and ______.
Calculate the current in a wire if a charge of 1500 coulomb flows through it in 5 minutes.
What does the direction of current convey?
