Explain why an ammeter must have a low resistance .

Explain why a voltmeter must have very high resistance?

A thick wire has a low resistance.

An ammeter should have very low resistance, so that it may

An ammeter gives full deflection when a current of 2 amp . Flows through it. The resistance of ammeter is 12 ohms . If the same ammeter is to be used for measuring a maximum current of 5 amp , then the ammeter must be connected with a resistance of

Give reasons : Explain why rails have gaps at specific distances .

A galvanometer has a resistance of 16 Omega and gives a full scale deflection, when a current of 20 mA is passed through it. The only shunt resistance available is 0.04 Omega which is not appropriate to convert galvanometer into an ammeter. How much resistance should be connected in series with coil of galvanometer so that the range of ammeter is 10 A?

Explain the term thermal resistance. State its SI unit and dimensions.

Give scientific reasons. Why does a thick wire have low resistance?

Which region in a transistor has a low and high resistance?

Assertion : The voltmeter is a low resistance galvanometer. Reason : The potential difference is measured across a resistance.