What is the total power of a series circuit if E = 75V and I = 50mA?

To find the total power in a series circuit, you can use the formula:

[ P = E \times I ]

where ( P ) represents power in watts, ( E ) is voltage in volts, and ( I ) is current in amperes.

In this case, the voltage ( E ) is given as 75 volts, and the current ( I ) is given as 50 mA. To use the formula correctly, it's important to convert the current from milliamperes to amperes:

[ 50 , \text{mA} = 0.050 , \text{A} ]

Now, substituting the values into the power formula:

[ P = 75 , \text{V} \times 0.050 , \text{A} ]

Calculating this gives:

[ P = 75 \times 0.050 = 3.75 , \text{W} ]

Thus, the total power in the series circuit is 3.75 watts. This confirms the provided answer. The calculation illustrates the direct relationship between voltage and current in determining power within a circuit, highlighting how multiplying the two yields the total energy consumed