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How Many Microamperes Are There in 1 Ampere?

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प्रश्न

How many microamperes are there in 1 ampere?

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उत्तर

1 ampere = 1,000,000 microamperes = `10^6` microamperes  

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अध्याय 4: Electricity - Exercise 2 [पृष्ठ १९६]

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लखमीर सिंग Physics Part 1 [English] Class 10
अध्याय 4 Electricity
Exercise 2 | Q 8. (b) | पृष्ठ १९६

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संबंधित प्रश्न

A student made an electric circuit shown here to measure the current through two lamps.

Are the lamps in series or parallel?  

(a) Are the lamps in series or parallel?
(b) The student has made a mistake in this circuit. What is the mistake?
(c) Draw a circuit diagram to show the correct way to connect the circuit. Use the proper circuit symbols in your diagram. 


The figure given below shows an electric circuit in which current flows from a 6 V battery through two resistors. 

 

  1. Are the resistors connected in series with each other or in parallel?
  2. For each resistors, state the p.d. across it.
  3. The current flowing from the battery is shared between the two resistors. Which resistor will have bigger share of the current?
  4. Calculate the effective resistance of the two resistors.
  5. Calculate the current that flows from the battery.

Give three reasons why different electrical appliances in a domestic circuit are connected in parallel.


Ten bulbs are connected in a series circuit to a power supply line. Ten identical bulbs are connected in a parallel circuit to an identical power supply line. 

(c) In which circuit, if one bulb blows out, all other will stop glowing?


In which of the following cases more electrical energy is consumed per hour?

(i) A current of 1 ampere passed through a resistance of 300 ohms.
(ii) A current of 2 amperes passed through a resistance of 100 ohms. 

 


Define the term resistivity. 


A wire of uniform thickness with a resistance of 27Ω is cut into three equal pieces and they are joined in parallel. Find the equivalent resistance of the parallel combination. 


Distinguish between an open and a closed circuit.


What happens to the resistance if the conductor is made thinner?

An electric kettle is rated 3 kW, 250 V. Give reason whether this kettle can be used in a circuit which contains a 13 A fuse.

Can a copper wire be used as a fuse wire?

An auto lamp is joined to a battery of e.m.f. 4 V and internal resistance 2.5Ω. A steady current of 0.5 A flows through the circuit. Calculate the
(a) Total energy provided by battery in 10 minutes,
(b) Heat dissipated in the bulb in 10 minutes.


A wire is passed through a piece of cardboard as shown in fig .. An electric current flows vertically down the wire and then flows back up. The two sections of the write are observed to repel each other.
(a) Wi th the aid of a diagram, describe how you would plot the magnetic field lines on the card .

(b) Sketch the magnetic field patterns around both the sections of the wire. Use your sketch to explain why the two sections repel each other.
(c) The repulsive force between the two sections is small. What changes could be made to increase it?


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?

How is direction of current related to the direction of flow of electrons?


MCB is used to protect household electrical appliances.


Unit of electric power may also be expressed as


Assertion (A): Electric current will not flow between two charged bodies when connected if their charges are the same.
Reason (R): Current is the rate of flow of charge.


The magnitude of Alternating Current (AC):


Common sources of Direct Current (DC) are:


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