A geyser has a label $2 k W, 240 V$ . What is the cost of running it for $30 m i n u t e s,$ if the cost of electricity is $r u p e e s 3$ per unit?

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Solution

Step 1: Given data
Power, $P = 2 k W$
Voltage, $V = 240 V$
Time for which it is running, $t = 30 m i n u t e s$
cost of electricity per unit $= ₹ 3$
Step 2: Calculating electrical energy consumed
$E = p o w e r \times t i m e = 2 k W \times 0.5 h o u r s = 1 k W h (o r 1 c o m m e r c i a l u n i t)$
Step 3: Calculating the cost of electricity
Cost= $₹ 3 \times 1 = ₹ 3$
Hence, the cost of running is $₹ 3$ .

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