## Electric power and energy

Electrical energy is easily converted to other forms of energy by operation of different electrical appliances, but unsafe use of electricity causes electric fire and shock, that might lead to serious injuries or even death to users. Using fuses, circuit breakers, switches and earthing wires in electrical appliances are safety features in preventing both electrical fire and shock. Heating effect …

## Practical Electric Circuitry

This topic covers “Practical Electric Circuitry” of O Level Physics. (Equivalent to American high school diploma) Sub-Topics: Electric power and energy Measurement of electrical power and energy Dangers Of Electricity Electricity in the home Fuse and circuit breakers Switch Need for earthing and double insulation Wiring a mains plug Quiz: Quiz For Static Electricity, Current Electricity, D.C. Circuits and Practical …

## Questions For Kinematics (JC) Set 2U

6. Explain whether or not the following particles have an acceleration: (a) a particle moving in a straight line with constant speed, (b) a particle moving around a curve with constant speed. Ans: (a) no (b) yes. In the second case, the particle is continuously changing the direction of its velocity vector. 7. A sailor drops a wrench from the …

## Questions For Kinematics (JC) Set 1U

1.The average velocity of a particle moving in one dimension has a positive value. Is it possible for the instantaneous velocity to have been negative at any time in the interval? Suppose the particle started at the origin x = 0. If its average velocity is positive, could the particle ever have been in the – x region of the …

## Questions For Measurement (JC) Set 2U

6. Can the magnitude of particle’s displacement be greater than the distance traveled? Explain. Ans: No, the magnitude of the displacement is always less than or equal to the distance travelled. If two displacements in the same direction are added, then the magnitude of their sum will be equal to the distance travelled. Two vectors in any other orientation will …

## Questions For Measurement (JC) Set 1U

1. What types of natural phenomena could serve as time standards? Ans: Atomic clocks are based on electromagnetic waves which atoms emit. Also, pulsars are highly regular astronomical clocks. 2. Supposed the three fundamental standards of the metric system were length, density, and time rather than length, mass, and time. The standard of density in this system is to be …

## Sources In Series

When two or more sources are arranged so that the positive terminal of one is connected to the negative terminal of the next, they are said to be in series and their e.m.f.s add up. This arrangement gives increased e.m.f. because, the charge flowing round a circuit will pass through more than one source and gains electrical potential energy from …