Tag: physics

Five cells each of emf $\varepsilon $ and internal resistance r each are connected in series. If one cell is connected wrongly, then potential difference across this cell will be

State whether given statement is True or False
We use battery cell in our everyday life ?

A wire of length $L$ and $3$ identical cells of negligible internal resistances are connected in series. Due to the current, the temperature of the wire is raised by $\Delta\ T$ in a time $t$. A number $N$ of similar cells is now connected in series with a wire of the same material and cross-section but of length $2\ L$. The temperature of the wire is raised by the same amount $\Delta\ T$ in the same time. The value of $N$ is

Two cells of emf's $3V$ and $3V$ have internal resistances  $1.5\Omega\ &\ 1\Omega$ are connected in parallel across $3\Omega,$ such that they send the current through $3\Omega$ in same direction calculate the p.d. across $3\Omega$ resistor.

How many cells each marked ( 12V - A) should be connected  in mixed  grouping  so that it may be marked as ( 48 V- 18 A)  

Why the bulb brighter in a simple circuit that has more cells?

Two Leclanche cells assisting each other could be balanced on a length $L$ of a potentiometer wire. If the current through the wire is halved, what will be balancing length for one Leclanche cell?

The two ends of a copper conductor of length 3.2 cm are connected to a battery acceleration of free electrons is

A cell in which chemical energy is converted into electric energy by first passing a current through it is called a _________.

In torch light cell is used as source of which energy ?