Physics – 4.2.4 Resistance | e-Consult
4.2.4 Resistance (1 questions)
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Given:
- Resistance (R) = 10 Ω
- Voltage (V) = 12 V
- Time (t) = 10 s
Equation 1 (Power):
Power (P) = V2 / R
Calculation 1:
P = (12 V)2 / 10 Ω
P = 144 / 10 W
P = 14.4 W
Equation 2 (Electrical Energy):
Electrical Energy (E) = Power (P) x Time (t)
Calculation 2:
E = 14.4 W x 10 s
E = 144 J
Answer: The power of the lamp is 14.4 W and the electrical energy used is 144 J.