Calculating Heat Flow in Electric Iron
The problem asks for the heat generated by an electric iron given its resistance, current, and the time duration.
Given Data:
- Resistance, $R$ = 20 ohm
- Current, $I$ = 5 A
- Time, $t$ = 30 s
Formula Used:
The heat generated by an electrical appliance is calculated using Joule's law of heating:
$H = I^2 R t$
Where:
- $H$ is the heat generated (in Joules, J)
- $I$ is the current flowing (in Amperes, A)
- $R$ is the resistance (in Ohms, $\Omega$)
- $t$ is the time (in Seconds, s)
Calculation:
Substitute the given values into the formula:
$H = (5\text{ A})^2 \times (20\ \Omega) \times (30\text{ s})$
First, calculate the square of the current:
$I^2 = (5)^2 = 25\text{ A}^2$
Now, multiply this by the resistance and time:
$H = 25\text{ A}^2 \times 20\ \Omega \times 30\text{ s}$
$H = 500 \times 30\text{ J}$
$H = 15000\text{ J}$
Expressing this in scientific notation:
$H = 1.5 \times 10^4\text{ J}$
Result:
The heat flow in 30 seconds is $1.5 \times 10^4\text{ J}$.
Similar Questions
- The body of the cooking vessel is of metal and handles are of plastic because ______.
- Why do we feel cool after applying water on our skin in summer?
- ______ is the unit of thermal conductivity.
- The heat generated while transferring 96000 coulomb of charge in one hour through a potential difference of 50 V is
- The volume of a given amount of water ______ when its temperature is increased from \(0^\circ\text{C}\) to \(4^\circ\text{C}\).
- The SI unit of heat energy transferred is expressed in ______.
The resistance of a metal rod depends on all of the following, except ______.
Which statement correctly differentiates heat and temperature based on their SI units?
Which of the following is NOT an effect of heat?
Which statement correctly defines the temperature of a body?
Important Questions from Heat and Transfer
In summer season, the top and outer surface of the house are painted white because:
Which of the following is a process in which hot, less dense materials rise upward and are replaced by colder, more dense materials?
What is the heat released by a heating filament rated 24 W when it is kept on for 6 seconds?
Space is left between logs of wood when they are burnt, so that:
On a hot summer afternoon, the tent made up of fabric will be preferred as white colour is:
