Chapter 3 Current Electricity
Top questions
See all →- Why are fuse wires used? Used to protect domestic appliances, fuse wire has specific melting point and is made of a mixture of substances. It is connected in series... 1
- Explain Ohm’s law with the formula. George Simon Ohm, a German Scientist put across a law known as Ohm’s law, from which the relationship between the current flowing through a... 1
- What are free electrons? Free electrons are the one or more outer shell electrons found in every atom of a metallic conductor, which are bound weakly to the nucleus.... 1
- If a charge of 420 C flows through a conducting wire in 5 minutes what is the value of the current? Current flowing through the conducting wire is I= Charge(Q)/Time (t) ⇒I=420/(5×60)=420/300=1.4 A Hence, the current flowing through the wire... 1
- When two resistors are connected in series, their effective resistance is 80 Ω. When they are connected in parallel, Let the two resistances be R₁ and R₂. Therefore, R₁ + R_(2 )= 80 Ω or, R_(1 )= 80 −R₂-R₂ .....(i) and 1/R₁+1/R₂=1/20 ⇒R₁R₂=20(R₁+R₂) As, R₁=... 1
- The resistance of a 1 m long nichrome wire is 6 Ω. If we reduce the length of the wire to 70 cm. Resistance of a wire is directly proportional to its length. Let R_(1 )and R₂ be the resistances of the nichrome wire at 100 cm (1 m) and 70... 1