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Answer:
7.
Resistance is a measure of the opposition to current flow in an electrical circuit. Its SI unit is Ohm (Ω).
Given: R1= 3Ω R2= 9Ω t= 1m V= 14V We know that, Resistance1 + Resistance2 = Total Resistance. Now, R1 + R2 = R
=> (3+9)Ω = R
=> 12Ω = R
∴ the total resistance is 12Ω
We know that, Current = Voltage/Resistance.
Now, I = V/R
=> I = 14V/12Ω
=> I= 7/6 C
∴ the current is 7/6A
Now,
1 minute = 60 sec
Electrical Energy consumed by R₁ (3 Ω) in 60 sec,
⇒ W₁ = I²R₁t
where,
I = 7/6 A
R₁ = 3 Ω
t = 60 sec
⇒ W₁ = (7/6)² × 3 × 60
⇒ W₁ = 49/36 × 3 × 60
⇒ W₁ = 8820/36
⇒ W₁ = 245
∴ W₁ = 245 J.
Electrical Energy consumed by R₂ (9 Ω) in 60 sec,
⇒ W₂ = I²R₂t
where,
I = 7/6 A
R₂ = 9 Ω
t = 60 sec
⇒ W₂ = (7/6)² × 9 × 60
⇒ W₂ = 49/36 × 9 × 60
⇒ W₂ = 26460/36
⇒ W₂ = 735
∴ W₂ = 735 J.
8.
Aerobic: Aerobic respiration takes place in the mitochondria and requires oxygen and glucose, and produces carbon dioxide, water, and energy. (glucose + oxygen -> carbon dioxide + water). Anaerobic respiration also produces energy and uses glucose, but it produces less energy and does not require oxygen.
Aerobic respiration is far more energy-efficient than anaerobic respiration. Aerobic processes produce up to 38 ATP per glucose. Anaerobic processes yield only 2 ATP per glucose.
Answer:
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