Answer:
The ability to react to a certain stimulus with a speedy and effective manner
Explanation:
Sorry to say but I know that t(e introduction is first and the coda is last
Animal Adaptation 1 Adaptation 2 Arctic Fox It's thick fur and fluffy tail help it survive in it's harsh habitat. Their small, pointy ears can hear their prey moving around in underground tunnels. An Arctic fox's fur changes colors with the seasons of the year. The Arctic Fox has many unique adaptations.
Explanation:
Power of electric kettle, P = 1 kW
Voltage, V = 220 V
(a) Electric power is given by the formula as follows :
![P=\dfrac{V^2}{R}](https://tex.z-dn.net/?f=P%3D%5Cdfrac%7BV%5E2%7D%7BR%7D)
R is resistance
![R=\dfrac{V^2}{P}\\\\R=\dfrac{(220)^2}{10^3}\\\\R=48.4\ \Omega](https://tex.z-dn.net/?f=R%3D%5Cdfrac%7BV%5E2%7D%7BP%7D%5C%5C%5C%5CR%3D%5Cdfrac%7B%28220%29%5E2%7D%7B10%5E3%7D%5C%5C%5C%5CR%3D48.4%5C%20%5COmega)
(b) When connected to a 220 V supply, it takes 3 minutes for the water in the kettle to reach boiling point.
Energy supplied is given by :
![E=P\times t](https://tex.z-dn.net/?f=E%3DP%5Ctimes%20t)
P is power, ![P=\dfrac{V^2}{R}](https://tex.z-dn.net/?f=P%3D%5Cdfrac%7BV%5E2%7D%7BR%7D)
![E=\dfrac{V^2}{R}t\\\\E=\dfrac{(220)^2}{48.4}\times 180\\\\E=180000\ J\\\\E=180\ kJ](https://tex.z-dn.net/?f=E%3D%5Cdfrac%7BV%5E2%7D%7BR%7Dt%5C%5C%5C%5CE%3D%5Cdfrac%7B%28220%29%5E2%7D%7B48.4%7D%5Ctimes%20180%5C%5C%5C%5CE%3D180000%5C%20J%5C%5C%5C%5CE%3D180%5C%20kJ)
PART A)
Here we know that
potential difference across the wire is
![V = 78 volts](https://tex.z-dn.net/?f=V%20%3D%2078%20volts)
resistance of wire is
![R = 7 ohm](https://tex.z-dn.net/?f=R%20%3D%207%20ohm)
now by ohm's law
![V = iR](https://tex.z-dn.net/?f=V%20%3D%20iR)
![78 = i(7 ohm)](https://tex.z-dn.net/?f=78%20%3D%20i%287%20ohm%29)
![i = 11.14 A](https://tex.z-dn.net/?f=i%20%3D%2011.14%20A)
Part b)
Power rating is defined as rate of electrical energy
it is defined as
![P = iV](https://tex.z-dn.net/?f=P%20%3D%20iV)
now we have
![P = 11.14 ( 78)](https://tex.z-dn.net/?f=P%20%3D%2011.14%20%28%2078%29%20)
![P = 869.1 Watt](https://tex.z-dn.net/?f=P%20%3D%20869.1%20Watt)