Question
State and explain Joule’s law of heating.
✓
Answer
Joule's law of heating states that heat produced in joule when a current of I amphere flows in a wire of resistance R ohms for time t secounds is
Given by H = I2Rt
Thus the heat produced in a wire is directly proportional to:
Given by H = I2Rt
Thus the heat produced in a wire is directly proportional to:
- Square of current.
- Resistance of wire.
- Time for which current is passed.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
To construct a ray diagram we use two rays of light which are so chosen that it is easy to determine their directions after reflection from the mirror. Choose these two rays and state the path of these rays after reflection from a concave mirror. Use these two rays to find the nature and position of the image of an object placed at a distance of 15cm from a concave mirror of focal length 10cm.
A concave mirror produces a real image 1cm tall of an object 2.5mm tall placed 5cm from the mirror. Find the position of the image and the focal length of the mirror.
In the circuit diagram given below, the current flowing across 5 ohm resistor is 1 amp. Find the current flowing through the other two resistors.
When an object is placed 20cm from a concave mirror, a real image magnified three times is formed. Find:
- The focal length of the mirror.
- Where must the object be placed to give a virtual image three times the height of the object?
If the image formed by mirror for all positions of the object placed in front of it is always virtual and diminished, state the type of the mirror. Draw a ray diagram in support of your answer. Where are such mirrors commonly used and why?
A convex lens of focal length 6cm is held 4cm from a newspaper which has print 0.5cm high. By calculation, determine the size and nature of the image produced.
What is a spherical mirror? Distinguish between a concave mirror and a convex mirror.
Find the equivalent resistance across the two ends A and B of the following circuit.
What are the environmental consequences of the increasing demand for energy?
Why is biogas considered an ideal fuel for domestic use?