Question

you can make a smoothie in a blender with a power of 400 W and an efficiency of 85% how much energy is actually being used to make the smoothie in 30 seconds?

Answer 1

The energy actually used to make a smoothie in 30 seconds with a 400 W blender operating at 85% efficiency is 10200 joules.

Step-by-step explanation:

The question asks how much energy is actually being used by a blender with a power of 400 W and an efficiency of 85% to make a smoothie in 30 seconds. To find the energy consumed, we first need to calculate the total energy input and then apply the efficiency percentage to find the useful energy output.

The total energy input (Einput) over time (t) is given by the power (P) of the blender multiplied by the time, which is Einput = P × t. Since power is given in Watts (1 W = 1 J/s), the total energy input will be in Joules (J).

Thus, the total energy input for 30 seconds is:
Einput = 400 W x 30 s = 12000 J

However, not all this energy is used to make the smoothie due to the efficiency of the blender. So, the actual energy used (Eused) can be calculated as:
Eused = Efficiency x Einput = 0.85 x 12000 J = 10200 J.

Therefore, the energy actually used to make the smoothie in 30 seconds is 10200 joules.

Answer 2

1200 watt seconds
1.2. Kw seconds
1.2/ 3600 KWh