Question

Электрический звонок включенный в электрическую сеть напряжением 120в потребляет ток силой 25 ма сколько джоулей электрической энергии расходуется при нажатии на кнопки 2 сек

Answer 1

Q=UIt=120В*0,025А*2с=6Дж.
Ответ: 6Дж.

Answer 2

$A=Pt=JUt=25*10^{-3}A*120B*2c=6$Дж

Answer 3

Calculating Electrical Energy Consumption

To calculate the electrical energy consumption of the electric bell, we can use the formula:

Energy (in joules) = Power (in watts) × Time (in seconds)

First, we need to calculate the power consumed by the electric bell using the given voltage and current.

Calculating Power Consumption

The power consumed by the electric bell can be calculated using the formula:

Power (in watts) = Voltage (in volts) × Current (in amperes)

Given: - Voltage (V) = 120V - Current (I) = 25mA = 0.025A

Using the formula: Power = 120V × 0.025A

Power = 3 watts

Calculating Energy Consumption

Now that we have the power consumption, we can calculate the energy consumption when the bell is pressed for 2 seconds.

Given: - Time (t) = 2 seconds

Using the formula: Energy = Power × Time

Energy = 3W × 2s

Energy = 6 joules

Therefore, when the electric bell is pressed for 2 seconds, it consumes 6 joules of electrical energy.