- #1
PaulK
- 3
- 0
Here is the problem:
http://postimage.org/image/1jy6nol5w/
Method 1:
Steps
1. Calculate V(T1)=12*10=120V,
V(T2)=10*10=100V
2. Since V(3)=10V and I(3)=1A, P(T3)=10W
3. Since not otherwise stated, Assume transformers are perfect.
4. So P(T3)= P(T2) = 10W
5. known P(T2)=10w and V(T2) =100V, Calculate: I(T2)= 10/100 = 0.1 A
6. Since resistors are connected in series, Current through each resistor = 0.1A
7. Power Loss = (0.1)^2 * R = 0.001 * 16 = 0.16WMethod 2.
1. Calculate V(T1)=12*10=120V,
V(T2)=10*10=100V
2. Voltage consume by resistors = V(T1)- V(T2) = 120 -100 =20V
3. Power loss = (20)^2 /16 = 25W
Both method seem to make sense, but of course only one of the is right (Or none?)
Please tell me which one is wrong and why.
Thanks a lot.
http://postimage.org/image/1jy6nol5w/
Method 1:
Steps
1. Calculate V(T1)=12*10=120V,
V(T2)=10*10=100V
2. Since V(3)=10V and I(3)=1A, P(T3)=10W
3. Since not otherwise stated, Assume transformers are perfect.
4. So P(T3)= P(T2) = 10W
5. known P(T2)=10w and V(T2) =100V, Calculate: I(T2)= 10/100 = 0.1 A
6. Since resistors are connected in series, Current through each resistor = 0.1A
7. Power Loss = (0.1)^2 * R = 0.001 * 16 = 0.16WMethod 2.
1. Calculate V(T1)=12*10=120V,
V(T2)=10*10=100V
2. Voltage consume by resistors = V(T1)- V(T2) = 120 -100 =20V
3. Power loss = (20)^2 /16 = 25W
Both method seem to make sense, but of course only one of the is right (Or none?)
Please tell me which one is wrong and why.
Thanks a lot.