Question

СРОЧНО Какую работу совершает зарядное устройство мобильного телефона за один час зарядки, если напряжение на его клеммах 5 В, а сила тока 800 мА? Ответ дать в кДж.!!!!!

Answer 1

Ответ:

14,4 кДж

Объяснение:

t=3600 c    U=5 B    I=0.8 A     A=?

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A=I*U*t=0.8*5*3600=14.4*10³ Дж

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Answer 2

Calculating Work Done by a Phone Charger

To calculate the work done by a phone charger in one hour of charging, we can use the formula:

Work (in joules) = Voltage (in volts) × Current (in amperes) × Time (in seconds)

Given: - Voltage (V) = 5 V - Current (I) = 800 mA = 0.8 A (since 1 A = 1000 mA) - Time (t) = 1 hour = 3600 seconds (since 1 hour = 60 minutes = 60 × 60 seconds)

Using the formula, we can calculate the work done in joules:

Work = 5 V × 0.8 A × 3600 s

Now, let's calculate the work done in kilojoules (kJ) by converting the result from joules to kilojoules:

1 kJ = 1000 J

Calculation

``` Work = 5 V × 0.8 A × 3600 s = 14400 J = 14.4 kJ ```

Therefore, the work done by the phone charger in one hour of charging, with a voltage of 5 V and a current of 800 mA, is 14.4 kJ.