cricri2347
23.06.2021 •
Physics
A battery-powered set of five patio lanterns is connected in series. An ammeter measures the current through the battery as 0.75 A. The total resistance of the circuit is 52 0. (a) Calculate the voltage drop across the battery. (b) Calculate the voltage drop across each load.
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Ответ:
(a) 39 V
(b) 7.8 V
Explanation:(a) Neglecting the internal resistance of the battery, the voltage drop (V) across the battery is found from Ohm's law as follows;
V = IR -------------------------(i)
Where;
I = current through the battery
R = total resistance of the circuit.
From the question;
I = 0.75A
R = 52.0Ω
Substitute the values of I and R into equation (i)
=> V = 0.75 x 52.0
=> V = 39Volts
Therefore, the voltage drop across the battery is 39 Volts
(b) Since the set of lanterns is connected in series, then the same current flows through each of the lanterns. Also, since the lanterns are identical, the resistance () of each of them is given by the total resistance (R = 52.0Ω) divided by the number of lanterns. i.e
=
= 10.4Ω [Each lantern has a resistance of 10.4Ω]
The current flowing through them is the same as the current (I = 0.75A) flowing the circuit.
Therefore, using Ohm's law, the voltage drop ()across each load (lantern) is
= I x
= 0.75 x 10.4
= 7.8Volts
Therefore, the voltage drop across each load is 7.8 Volts
Ответ:
Remember that the vertex form of a parabola is where is the vertex of the parabola.
Now, to find the vertex of the parabola, we are going to use the vertex formula:
For a quadratic of the form , the vertex is given by:
in other words, we find by evaluating the function at
We know form our quadratic that and , so let's use our formula to find :
Now we can evaluate our function at to find :
Now, we can rewrite our parabola in vertex form:
, , and
We can conclude that the correct answer is: y = 6(x + 1)2 – 16