If a bulb is designed to work at 12 volts and 0.5 amperes, what should be the resistance of the filament according to Ohm's Law?
24 ohms
Ohm's Law states that \(V = IR\), so the resistance of the filament is \(R = V/I\).
Substituting the rated values: \(R = 12\,\text{V} \div 0.5\,\text{A} = 24\,\Omega\).
Hence, the resistance of the bulb's filament is 24 ohms.
Hence, 24 ohms.
A car of mass 1000 kg moves with a velocity of 20 m/s. The kinetic energy of the car is _______________.
According to Rutherford's model, where is most of the mass of an atom concentrated?
Which of the following best describes the path of a light ray as it enters and then exits a glass slab from air?
If the frequency of a sound wave is 10 Hz, its time period is:
During free fall, when an object is released from rest, how does the gravitational force of the Earth affect its motion?
A stone is thrown vertically downwards with a speed of 5 m/s from the top of a tower. What will be its velocity after 2 seconds? (Take g = 10 m/s2)
Which of the following factors will increase the strength of the magnetic field at the center of a current-carrying circular loop?
A doctor uses a stethoscope to listen to a patient’s heartbeat. How does the stethoscope help the doctor hear faint heart sounds more clearly?
A ball of mass 0.5 kg is accelerated at 4 m/s2. If a second ball of mass 1 kg is to achieve the same acceleration, what force must be applied to it?
A box is pushed with a force of 20 N across a horizontal floor for a distance of 5 m in the direction of the force. What is the work done by the force?
What is the colour of the light emitted by the Sun?
Lightning occur in the sky when two clouds:
With reference to street-lighting, how do sodium lamps differ from LED lamps?
1. Sodium lamps produce light in 360 degrees but it is not so in the case of LED lamps.
2. As street lights, sodium lamps have a longer life span than LED lamps.
3. The spectrum of visible light from sodium lamps is almost monochromatic while LED lamps offer significant colour advantages in street lighting.
Select the correct answer using the code given below.
In a pressure cooker, the temperature at which the food is cooked depends mainly upon which of the following?
1. Area of the hole in the lid
2. Temperature of the flame
3. Weight of the lid
Select the correct answer using the code given below.
The famous phenomenon 'Raman Effect' discovered by Nobel laureate CV Raman is related to which field of physics?