English

What is the Current Flowing Through Conductor - Science and Technology 1

Advertisements
Advertisements

Question

If the potential difference across the ends of a conductor is 220 V and the resistance of the conductor is 44 Ω (ohm), then the current flowing through is _________.

  1. 0.2 A
  2. 0.5 A
  3. 2 A
  4. 5 A

Solution

(d) 5 A

V = IR

∴ 220 V = I x 44 Ω

Or, `"I"=(220"V")/(44Omega)=5"A"`

 

shaalaa.com
  Is there an error in this question or solution?
2014-2015 (March)

APPEARS IN

RELATED QUESTIONS

Will current flow more easily through a thick wire or a thin wire of the same material, when connected to the same source? Why?


The relationship between the potential difference and the current in a conductor is stated in the form of a law.

1) Name the law.

2) What does the slope of V-I graph for a conductor represent?

3) Name the material used for making the connecting wire.


Write the formula of resistivity


When a 12 V battery is connected across an unknown resistor, there is a current of 2.5 mA in the circuit. Calculate the value of the resistance of the resistor.


The unit of electrical resistance is:

(a) ampere
(b) volt
(c) coulomb
(d) ohm


The graph between V and I for a conductor is a straight line passing through the origin. 

 Which law is illustrated by such a graph?


How should the two resistances of 2 ohms each be connected so as to produce an equivalent resistance of 1 ohm?


How much energy is consumed when a current of 5 amperes flows through the filament (or element) of a heater having resistance of 100 ohms for two hours? Express it in joules.


 A resistance of 40 ohms and one of 60 ohms are arranged in series across 220 volt supply. Find the heat in joules produced by this combination of resistances in half a minute.


State Ohm’s law and draw a neat labelled circuit diagram containing a battery, a key, a voltmeter, an ammeter, a rheostat and an unknown resistance to verify it. 


What is the necessary condition for a conductor to obey Ohm’s law? 


An electric bulb draws 1.2 A current at 6.0 V. Find the resistance of filament of bulb while glowing.


In the circuit shown below in Fig, calculate the value of x if the equivalent resistance between A and B is 4 Ω.


Calculate the electric field in a copper wire of cross-sectional area 2.0 mm2 carrying a current of 1 A.
The resistivity of copper = 1.7 × 10–8 Ω m


How does an increase in the temperature affect the specific resistance of a : 
(i) Metal and
(ii) Semiconductor ?


Calculate the effective resistance across AB?


Consider the sacle of voltmeter shown in the diagram and answer the following questions : 

(a) What is the least count of the voltmeter?

(b) What is the reading shown by the voltmeter ?

(c) If the voltmeter is connected across a resistor of 20 `Omega` how much current is flowing through the resistor?


Does Ohm's law hold good for semiconductors and electrolytic solutions?

Tick(✓) the correct choice in the following:

Ohm's law is applicable to


State Ohm's law. What are its limitations?

Rewrite the following statement by selecting the correct option.

The S.I. unit of resistance is __________.


What are ohmic conductors? Give one exmaple. Draw a graph showing the current-voltage relationship for an ohmic conductor.


Define Current density.


State microscopic form of Ohm’s law.


State macroscopic form of Ohm’s law.


What is non ohmic device?


Write a short note on superconductors?


Obtain the macroscopic form of Ohm’s law from its microscopic form and discuss its limitation.


Explain the equivalent resistance of a parallel resistor network.


The unit of specific resistance is ____________.


The slope of voltage (V) versus current (I) is called:


Calculate the total resistance of the circuit and find the total current in the circuit.


Ohm's law deals with the relationship between ______


What is the resistance of a conductor through which a current of 0.5 A flows when a potential difference of 2V is applied across its ends?


Vinita and Ahmed demonstrated a circuit that operates the two headlights and the two sidelights of a car, in their school exhibition. Based on their demonstrated circuit, answer the following questions.

  1. State what happens when switch A is connected to:
    a) Position 2
    b) Position 3
  2. Find the potential difference across each lamp when lit.
  3. Calculate the current.
    a) in each 12 Ω lamp when lit.
    b) In each 4 Ω lamp when lit.
    OR
  4. Show, with calculations, which type of lamp, 4.0 Ω or 12 Ω, has the higher power.

Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×