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3 years ago

7

Elements that easily transmit electricity and heat display the property know as ______

2 answers:

andre [41]3 years ago

7 0

It is known as conductivity

Slav-nsk [51]3 years ago

4 0

The property that<span> easily transmit electricity and heat is conductivity. :)</span>

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A bromine atom has an atomic number of 35 and an atomic mass of 80. What is the structure of this atom?

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2 years ago

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3 years ago

A kettle is rated at 1 kW, 220 V. Calculate the working resistance of the kettle.

Anna [14]

Explanation:

Power of electric kettle, P = 1 kW

Voltage, V = 220 V

(a) Electric power is given by the formula as follows :

$P=\dfrac{V^2}{R}$

R is resistance

$R=\dfrac{V^2}{P}\\\\R=\dfrac{(220)^2}{10^3}\\\\R=48.4\ \Omega$

(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 :

$E=P\times t$

P is power, $P=\dfrac{V^2}{R}$

$E=\dfrac{V^2}{R}t\\\\E=\dfrac{(220)^2}{48.4}\times 180\\\\E=180000\ J\\\\E=180\ kJ$

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3 years ago