Question

6.ЭДС батареи равно 20В.Сопротивление внешней цепи 2 Ом, сила тока 4А. Определите КПД батареи.

Answer 1

Ответ:

ответ------------------- -_-_-_-_-_- 40%

Answer 2

Ответ: 40%

Объяснение:

Дано:

ЭДС=20В

R=2 Ом

I=4А

-----------

η-;

η=U/ЭДС=IR/ЭДС=4*2/20=0,4*100%=40%

Answer 3

Calculation of Efficiency (КПД) of the Battery

To calculate the efficiency (КПД) of the battery, we need to know the electromotive force (ЭДС) and the total resistance of the external circuit.

Given: - Electromotive force (ЭДС) of the battery = 20V - Resistance of the external circuit = 2Ω - Current flowing through the circuit = 4A

The efficiency (КПД) of the battery can be calculated using the formula:

КПД = (Useful Power Output / Total Power Input) x 100%

To calculate the useful power output, we can use the formula:

Useful Power Output = (Current^2) x Resistance

Substituting the given values: - Current (I) = 4A - Resistance (R) = 2Ω

Useful Power Output = (4A)^2 x 2Ω = 32W

To calculate the total power input, we can use the formula:

Total Power Input = (Current^2) x Total Resistance

Since the total resistance is equal to the resistance of the external circuit, we can use the same value of 2Ω.

Total Power Input = (4A)^2 x 2Ω = 32W

Now we can substitute the values into the efficiency formula:

КПД = (32W / 32W) x 100% = 100%

Therefore, the efficiency (КПД) of the battery is 100%.

Please note that the calculation assumes an ideal battery with no internal resistance or losses. In practical scenarios, the efficiency may be lower due to factors such as internal resistance and other losses.