## An electric iron of resistance 20 Ω takes a current of 5 A. Calculate the heat developed in 30 s.

Q. An electric iron of resistance 20 Ω takes a current of 5 A. Calculate the heat developed in 30 s.   Answer:- Given that Resistance(R) = 20 Ω, Electric…

## Compute the heat generated while transferring 96000 coulomb of charge in one hour through a potential difference of 50 V.

Q. Compute the heat generated while transferring 96000 coulomb of charge in one hour through a potential difference of 50 V.   Answer:- Given Charge (Q) =96000C Time (t)=1hr=60×60=3600s Potential difference…

## Why does the cord of an electric heater not glow while the heating element does?

Q. Why does the cord of an electric heater not glow while the heating element does?   Answer:- The heating element of the heater is made up of alloy which…

## What is (a) the highest, (b) the lowest total resistance that can be secured by combinations of four coils of resistance

Q. What is (a) the highest, (b) the lowest total resistance that can be secured by combinations of four coils of resistance   Answer:- Given resistances R1 =4 Ω, R2=8 Ω, R3=12Ω, and R4=24Ω. (a)…

## How can three resistors of resistances 2 Ω, 3 Ω and 6 Ω be connected to give a total resistance of (a) 4 Ω, (b) 1 Ω?

Q. How can three resistors of resistances 2 Ω, 3 Ω and 6 Ω be connected to give a total resistance of (a) 4 Ω, (b) 1 Ω?   Answer:-…

## What are the advantages of connecting electrical devices in parallel with the battery instead of connecting them in series?

Q. What are the advantages of connecting electrical devices in parallel with the battery instead of connecting them in series?   Answer:- When the electric appliances are connected in parallel then…

## An electric lamp of 100 Ω, a toaster of resistance 50 Ω, and a water filter of resistance 500 Ω are connected in parallel to a 220 V source

Q. An electric lamp of 100 Ω, a toaster of resistance 50 Ω, and a water filter of resistance 500 Ω are connected in parallel to a 220 V source….

## Judge the equivalent resistance when the following are connected in parallel − (a) 1 Ω and 106Ω, (b) 1 Ω and 103Ω and 106Ω.

Q. Judge the equivalent resistance when the following are connected in parallel − (a) 1 Ω and 106Ω, (b) 1 Ω and 103Ω and 106Ω.   Answer:-