Question

1. Read the following and answer the questions ii) to in
A stronger person may do certain work in relatively less time A more powerful vehicle would complete
a journey in a shorter time than a less powerful one. We talk of the power of machines like motorbikes
and motorcars. The speed with which these vehicles change energy or do work is a basis for their
classification. Power measures the speed of work done, that is, how fast or slow work is done Power is
defined as the rate of doing work or the rate of transfer of energy. If an agent does a work in time f.
then power is given by:
Power work/time
or
The unit of power is watt [in honour of James Watt (1736 - 1819) having the symbol W. I watt is the
power of an agent, which docs work at the rate of 1 joule per second. We can also say that power is I w
when the rate of consumption of energy is IJs.
I walt 1 joule second or I W-1 Js-.
We express larger rates of energy transfer in kilowatts (kW)
1(i) What is the unit of power?
(a) Joule (b) Watt (c) Joule/second (d) both (b) and (c)
1(11) Which one of the following measures the speed of work done?
(a) Power (b) Work
(c) Energy (d) acceleration
1) Which of the following shows the relation between commercial unit and S. I unit of energy?
(a) 1 kWh = 6 x 10^6j
(b) 1 kWh = 3.6 x 10^6j
(c) i kWh = 6 x 10^5j
(d) 1 kWh = 3.6 x 10^6j​

Answer 1

Answer:

I Don't know sorryyyyyyyy