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enyata [817]
4 years ago
14

Which property justifies the fact that 8(d-5) is equivalent to 8d-40

Mathematics
1 answer:
zlopas [31]4 years ago
4 0
It is the distributivity of the multiplication from the subtraction

8*(d-5)=8*d-8*5=8d-40
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A 12 vdc power supply powers a blue high intensity led with a forward voltage of 4.5 volts. The led is rated to withstand a maxi
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Answer:

Resister of 0.15 W is to be added.

Step-by-step explanation:

In a given circuit we have the attachments

A power supply of 12 V

High intensity LED with forward voltage = 4.5V

LED is rated to withstand a maximum current of 20 mA or 20.10^{-30} A

We have to calculate the size of a resister to be connected in series.

Here we will apply the Ohm's law for the calculations

Total voltage of the circuit = voltage of LED + voltage across resistance.

12=4.5+20.10^{-3}.r

r = (12 - 4.5)/20.10^{-3}

r = 7.5×10^{3}/20 = 375 ohm

Therefore power of the resistance = i².r

P=i^{2}\times r

         =(20\times 10^{-3})^{2}\times 375

        = 0.15 W

Therefore a resister of 0.15 W is to be added.

6 0
3 years ago
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Answer:

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Step-by-step explanation:

For the typing purpose I replaced θ with n in the calculation

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5 0
3 years ago
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