Distinguish between good conductors, resistors and insulators. Name two good conductors, two resistors and two insulators.
Download our app for free and get started
Those substances which have very low electrical resistance are called as good conductors. E.g., copper and aluminium.
Those substances which have comparatively high resistance than conductors are known as resistors. E.g., nichrome and manganin.Those substances which have infinitely high electrical resistance are called insulators. E.g., rubber and wood.
Those substances which have comparatively high resistance than conductors are known as resistors. E.g., nichrome and manganin.Those substances which have infinitely high electrical resistance are called insulators. E.g., rubber and wood.
Download our appand get started for free
Experience the future of education. Simply download our apps or reach out to us for more information. Let's shape the future of learning together!No signup needed.*
Similar Questions
- 1With the help of a circuit diagram, obtain the relation for the equivalent resistance of two resistances connected in parallel. In the circuit diagram shown below, find:View Solution
- Total resistance.
- Current shown by the ammeter $A$
- 2View SolutionWhat is a circuit diagram? Draw the labelled diagram of an electric circuit comprising of a cell, a resistor, an ammeter, a voltmeter and a closed switch (or closed plug key). Which of the two has a large resistance: an ammeter or a voltmeter?
- 3View SolutionConsider the circuit given below where A, B and C are three identical light bulbs of constant resistance.
- List the bulbs in order of increasing brightness.
- If C burns out, what will be the brightness of A now compared with before?
- If B burns out instead, what will be the brightness of A and C compared with before?
- 4An electric iron is connected to the mains power supply of $220V$. When the electric iron is adjusted at ‘minimum heating’ it consumes a power of $360W$ but at ‘maximum heating’ it takes a power of $840W$. Calculate the current and resistance in each case.View Solution
- 5View SolutionA resistor has a resistance of 176 ohms. How many of these resistors should be connected in parallel so that their combination draws a current of 5 amperes from a 220 volt supply line?
- 6View SolutionWhat would be the effect on the resistance of a metal wire of:
- Increasing its length?
- Increasing its diameter?
- Increasing its temperature?
- 7Two resistances when connected in parallel give resultant value of $2$ ohm; when connected in series the value becomes $9$ ohm. Calculate the value of each resistance.View Solution
- 8View SolutionWhat is Ohm’s law? Explain how it is used to define the unit of resistance.
- 9View SolutionA p.d. of 10V is needed to make a current of 0.02A flow through a wire. What p.d. is needed to make a current of 250mA flow through the same wire?
- 10View SolutionDraw circuit symbols for:
- Fixed resistance.
- Variable resistance.
- A cell.
- A battery of three cells.
- An open switch.
- A closed switch.