Question

What uses more energy - a 250W TV set in 1 h or a 1200W toaster In 10 minutes ?​

Answer 1

Given:-

• A TV of 2500W running 1 hour.
• A 1200 W toaster running 10 minutes.

To Find:-

• Which uses more energy .

Formula Used:-

We know that Power is equal to Work/Energy ÷ Time .

$\large\purple{\underline{\boxed{\pink{\bf{\dag Power=\bigg(\dfrac{Work/Energy}{Time}\bigg)}}}}}$

Calculation:-

➤ Electrical Toaster -

• Power = 1200 Watts.
• time = 10 min.

Now 10min = 10 × 60s = 600s .

Putting values in above formula stated ,

$\tt{:\implies Power=\dfrac{Energy}{Time} .}$

$\tt{:\implies 1200W =\dfrac{Energy}{600s}.}$

$\tt{:\implies Energy = 1200 \times 600s .}$

$\underline{\boxed{\red{\tt{\longmapsto Energy = 7.2\times 10^5 Joules }}}}$

➤ Television -

• Power = 2500 Watts.
• time = time = 1hour .

Now 1 hour = 1 × 60 × 60 s = 3600s

$\tt{:\implies Power=\dfrac{Energy}{Time} }$

$\tt{:\implies 2500W =\dfrac{Energy}{3600s}.}$

$\tt{:\implies Energy = 2500 \times 3600s .}$

$\tt :\implies Energy = 9,000,000$

$\underline{\boxed{\red{\tt{\longmapsto Energy = 9 \times 10^6 Joules }}}}$

$\underline\green{\tt{\orange{\leadsto Hence\:TV\:set\: consumes\:more\:energy.}}}$