Question

ЭДС батарейки карманного фонарика равна 3,7 В, внутреннее сопротивление 1,5 Ом. Батарейка замкнута на сопротивление 11,7 Ом. Каково напряжение (мВ) на зажимах батарейки? целое число должно получится

Answer 1

Ответ:

Объяснение:

Закон Ома для полной цепи $I=\frac{E}{R+r}$

Найдем $I=\frac{3.7}{11,7+1,5}$ => I=0,28А

J=U/R U=IR=0,28*11,7=3,276 В

Округлим получим 3,28 В

Answer 2

Calculation of the Voltage on the Battery Terminals

To calculate the voltage on the terminals of the battery, we can use Ohm's Law, which states that the voltage (V) is equal to the current (I) multiplied by the resistance (R). In this case, the internal resistance of the battery is 1.5 Ohms, and the external resistance is 11.7 Ohms.

The total resistance in the circuit can be calculated by adding the internal and external resistances: Total resistance (R_total) = Internal resistance (R_internal) + External resistance (R_external)

Using the given values: R_total = 1.5 Ohms + 11.7 Ohms = 13.2 Ohms

The current flowing through the circuit can be calculated using Ohm's Law: Current (I) = Voltage (V) / Total resistance (R_total)

Since the voltage of the battery is given as 3.7 V, we can substitute the values into the equation: 3.7 V = I / 13.2 Ohms

Solving for the current: I = 3.7 V * 13.2 Ohms = 0.2803 A (approximately)

Now, we can calculate the voltage drop across the internal resistance of the battery: Voltage drop across internal resistance (V_internal) = Current (I) * Internal resistance (R_internal)

Substituting the values: V_internal = 0.2803 A * 1.5 Ohms = 0.4205 V (approximately)

Finally, we can calculate the voltage on the terminals of the battery by subtracting the voltage drop across the internal resistance from the battery voltage: Voltage on the terminals of the battery = Battery voltage - Voltage drop across internal resistance

Substituting the values: Voltage on the terminals of the battery = 3.7 V - 0.4205 V = 3.2795 V (approximately)

Therefore, the voltage on the terminals of the battery is approximately 3.28 V.

Please note that the calculated values are approximate due to rounding errors and the limited precision of the given values.