मराठी
तामिळनाडू बोर्ड ऑफ सेकेंडरी एज्युकेशनएस.एस.एल.सी. (इंग्रजी माध्यम) इयत्ता ७

What is the speed of electric current?

Advertisements
Advertisements

प्रश्न

What is the speed of electric current?

एका वाक्यात उत्तर
Advertisements

उत्तर

Current travels at the speed of 1/100th times the speed of light 0.0002 m/s.

shaalaa.com
  या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
पाठ 2: Electricity - Evaluation [पृष्ठ ३३]

APPEARS IN

सामाचीर कलवी Science - Term 2 [English] Class 7 TN Board
पाठ 2 Electricity
Evaluation | Q VII. 1. | पृष्ठ ३३

संबंधित प्रश्‍न

If the charge on an electron is 1.6 × 1019 coulombs, how many electrons should pass through a conductor in 1 second to constitute 1 ampere current?


A battery and three lamps are connected as shown: 

 

Which of the following statements about the currents at X, Y and Z is correct?
(a) The current at Z is greater than that at Y.
(b) The current at Y is greater than that at Z.
(c) The current at X equals the current at Y.
(d) The current at X equals the current at Z. 

 


Which is the better way to connect lights and other electrical appliances in domestic wiring: series circuits or parallel circuits? why?


State three factors on which the heat produced by an electric current depends. How does it depend on these factors? 


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?


Fig.  shows a 3 pin plug with the cover removed. The electric cable
connected to the plug contains 3 wires with colour coded insulation namely brown, blue and green.

  1. Identify each of the colour coded wires by stating to which of the
    terminals A, B or C in the diagram they should be connected.
  2. Identify the terminal through which no current passes in normal
    circumstances.
  3. What is the purpose of the earthed wire connected to an electric
    appliance like an electric heater? Describe how it works.

A 3 pin mains plug is fitted to the lead for a 1 kW electric kettle to be used on a 250 V A.C. supply. Which of the following statements is NOT correct?
(a) A 13 A fuse is the most appropriate value to use.
(b) The brown wire should be connected to the live side of the mains.


Tick (✓) the correct choice among the following :

There are 500 turns and 2000 turns in the primary and secondary coil of a
transformer respectively. If th e output voltage is 1000 V, how large is the
input voltage?


Transformers are usually designed so that their efficiency is as close to 100% as possible. Describe two features in transformer design which help to achieve high efficiency?

State whether true or false. If false, correct the statement.

Current can produce magnetic field.


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×