Question
A battery of emf 12 V and internal resistance 4 ohm is
connected to a resistor. If the current in the circuit is 0.6 A, what is the resistance of the resistor? What is the terminal voltage of the battery when the circuit is closed?Solution
Emf of the battery, E = 12V Internal resistance of the battery, r = 4 ohm Current = 0.6 A so, I = E/(R + r) R + r = E/I Â = 12/0.6 = 20 ohm Therefore = 20 - 4 = 16 ohm Terminal voltage of resistor = V so, V = IR => 0.6 x 16 => 9.6 V
The sum of the radius and height of a cylinder is 19m. The total surface area of the cylinder is 1,672 m². What is the volume of the cylinder?
The number of females working in the Production department forms approximately what per cent of the total number of females in the organization?
A hemisphere of radius 10 cm is melted and recast into the shape of a cone with a base diameter of 10 cm. Find the height of the cone.
The perimeter of 4 squares is 20 cm, 24 cm, 32 cm and 36 cm respectively. What will be the area of the square having perimeter equal to sum of edges of ...
- Find the total surface area of a cuboid that is formed by merging two identical cubes, where the surface area of each cube is given as 384 cm².
- A rod of length of 616 cm and 35cm radius is melted and converted into a sphere of radius 21cm, find how many such proper spheres can be made?
If the ratio of height and base of a parallelogram is 8:5, respectively and its area is 640 cm2, then find the difference between height and base of the...
- The sides of a cuboid are in the ratio 1:2:4. If its volume is 1728 cm³, find the sum of its dimensions.
4 boys from school A and 6 boys from school B together can set up an exhibition in 5 days, which 5 boys from school A and 10 boys from school C togethe...
- A wooden cuboid has its dimensions in the ratio 4:3:2 respectively. If its volume is 1536 cm³, then calculate its lateral surface area.
Relevant for Exams:
