This document discusses formulas for calculating power (P) in electrical circuits. It presents the formulas P=I^2R, which calculates power as a function of current and resistance, and P=V^2/R, which calculates power as a function of voltage and resistance. The document also shows examples of using these formulas to calculate the total power (PT) drawn by circuits with multiple resistors connected in series and parallel.

1. Applied Electrical Technology Two
+
- R1 R2 R3

2. Applied Electrical Technology Two
P =V I
P= I2 R
P =V2 /R

3. Applied Electrical Technology Two
P= I2 R

4. Applied Electrical Technology Two
P= I2 R
PT = P1 + P2 + P3
PT = (I12 X R1) + (I22 X R2) + (I32 X R3)
PT = (0.12 X 100) + (0.52 X 20) + (1.02 X 10)
PT = 1 +5 + 10
PT = 16 watt

5. Applied Electrical Technology Two
P =V2 /R

6. Applied Electrical Technology Two
P =V2 /R
PT = (V2 ÷ R1) + (V2 ÷ R2) + (V2 ÷ R3)
PT = (100 ÷ 100) + (100 ÷ 20) + (100 ÷ 10)
PT = (1) + (5) + (10)
PT = 16 watt

7. Applied Electrical Technology Two
P V I