Define the SI units of (i) current (ii) resistance.
Define the SI units of (i) current (ii) resistance.
Ans: – The SI unit of current is ampere and the resistance is ohm.
Name the instruments used to measure (i) current (ii) potential difference.
Ans: – The instrument is used for the measure of current is ammeter and for the potential difference is voltmeter.
Why is a conductor different from an insulator?
Ans: – A conductor passes the current from the one point to the other point whereas the insulator restricted the flow of current.
How is a volt related to an ohm and an ampere?
Ans: – We know volt or potential difference
= current × resistance.
Or, v=ir;
A number of bulbs are connected in a circuit. Decide whether the bulbs are connected in series or in parallel, when (i) the whole circuit goes off when one bulb is fused (ii) only the bulb that get fused goes off.
Ans: – In case one when the one bulb is goes off or fused then the all-other bulb in the circuit goes off this is an example of parallel connection.
And when the only one bulb is goes off then the connection is series connection.
When the potential difference across a wire is doubled, how will the following quantities be affected (i) resistance of the wire (ii) current flowing through the wire?
Ans: – We all know, voltage = current × resistance;
So, when the potential difference will be double then the resistance or current one of then get doubled.
How can three resistors of resistance 2Ω, 3Ω and 6Ω be connected to give a total resistance of (i) 11Ω (ii) 4.5Ω and (iii) 4Ω?
Ans: – (i) When all are connected is series then the equivalent resistance is (2 +3 + 6)= 11ohm.
(ii) Resistors 2Ω and 6Ω in parallel, but 3Ω is in series to the combination of 2Ω and 6Ω.
(iii) Resistors 3Ω and 6Ω in parallel but 2Ω is in series with the of 3Ω and 6Ω.
State two advantages of connecting electrical devices in parallel with the battery instead of connecting them in series.
Ans: – The benefits of parallel connection-
- Equivalent resistance decrease.
- If one is affected then remaining all going on.
- Follow on Facebook page – Click Here
- Google News join in – Click Here