Download App
The heat developed in an electric wire of resistance $R$ by a current $I$ for a time $t$ is
  • A$\frac{{{I^2}Rt}}{{4.2}}cal$
  • B$\frac{{{I^2}t}}{{4.2R}}cal$
  • C$\frac{{{I^2}R}}{{4.2\,t}}cal$
  • D$\frac{{Rt}}{{4.2\,{I^2}}}cal$
Easy
art

Download our app
and get started for free

Experience the future of education. Simply download our apps or reach out to us for more information. Let's shape the future of learning together!No signup needed.*
Download App

Similar Questions

  • 1
    A rod of a certain metal is $1.0\, m$ long and $0.6\, cm$ in diameter. Its resistance is $3.0 × {10^{ - 3}}\, ohm$. Another disc made of the same metal is $2.0\, cm$ in diameter and $1.0\, mm$ thick. What is the resistance between the round faces of the disc
    View Solution
  • 2
    In a meter bridge, the null point is found at a distance of $25\, cm$ from $A$ . If now a resistance of $10\,\Omega $ is connected in parallel with $S$, the null point occurs at mid point of $AB$. The value of $R$ is .............. $\Omega$
    View Solution
  • 3
    In the given current distribution what is the value of $I$ .............. $A$
    View Solution
  • 4
    In given circuit
    View Solution
  • 5
    A heating element has a resistance of  $100\,\Omega $ at room temperature. When it is connected to a supply of  $220\,V,$  a steady current of $2\,A$  passes in it and temperature is $500\,^oC$ more than room temperature. What is the temperature coefficient resistance of the heating element?
    View Solution
  • 6
    The mechanism of the heat produced in a conductor when an electric current flows through it, can be explained on the basis of
    View Solution
  • 7
    In the circuit shown, if a conducting wire is connected between points $A$ and $B,$ the current in this wire will
    View Solution
  • 8
    A wire has a non-uniform cross-section as shown in figure.A steady current flows through it. The drift speed of electrons at points $P$ and $q$ is $v_P$ and $v_Q$.
    View Solution
  • 9
    The specific resistance of a wire is $\rho $, its volume is $3\,{m^3}$ and its resistance is $3\, ohms$, then its length will be
    View Solution
  • 10
    Fig. shows rough sketch of meter bridge. $(G)$ deflects zero at length $l\, cm$. Now $R_1$ and $R_2$ are interchanged then balancing length increases by $25\, cm$. Find $R_1/R_2$ 
    View Solution