Question

learning task 2:read and analyze the given problem below on a sheet of paper.in a classroom there are five 20 -watt fluorescent lamps and four 50 watt electric fans operating for 10 hours in a regular school day​

Answer 1

Answer:

15kWh in 5 days

Step-by-step explanation:

Given

Let

$L \to Lamp\ \ \ F \to Fan$

$L = 20W$

$n(L) = 5$

$F = 50W$

$n(F) = 4$

$t = 10$ ---- Time

Required

Total energy consumed in 5 days

For the lamps, we have:

Calculate the energy consumed by the lamps in a day.

For 1 lamp, we have:

$L = 20W$

For 5, we have:

$5L = 5 * 20W$

$5L = 100W$

Convert to kilowatt

$5L = \frac{100W}{1000}$

$5L = 0.1KW$

In 1 day, the 5 bulbs use a total energy of:

$Daily\ Energy = Power * Time$

$Daily\ Energy = 0.1KW * 10h$

$Daily\ Energy = 1KWh$

For 5 days, the energy is:

$Energy = 5 * 1KWh$

$Energy = 5KWh$

For the fans, we have:

Calculate the energy consumed by the fans in a day.

For 1 fan , we have:

$F = 50W$

For 4, we have:

$4F = 4*50W$

$4F = 200W$

Convert to kilowatt

$4F = \frac{200W}{1000}$

$4F = 0.2kW$

In 1 day, the 4 fans will use a total energy of:

$Daily\ Energy = Power * Time$

$Daily\ Energy= 0.2kW * 10h$

$Daily\ Energy= 2kWh$

For 5 days, the energy is:

$Energy= 5 * 2kWh$

$Energy= 10kWh$

So, we have:

$Energy = 5KWh$ ------ Lamps

$Energy= 10kWh$ ----- Fans

The total energy used is:

$Total = 5kWh + 10kWh$

$Total = 15kWh$