In electrical engineering, ground or earth is the reference point in an electrical circuit from which voltages are measured, a common return path for electric current, or a direct physical connection to the earth. Electrical circuits may be connected to ground (earth) for several reasons.
Answer:
Why are human beings not called autotrophs even if they make their food in
the kitchen?
How does photosynthesis help to maintain the percentage of oxygen and
carbondioxide in the atmosphere?
Explain photosynthesis with the help of a word equation.
Answer:
voltage measured by the voltmeter = (E × RV)/(r + RV)
Explanation:
The circuit diagram for this description is presented in the attached image.
The internal resistance of an emf source is modelled to be in series with the source.
Therefore, the end product is a circuit with the battery in series connection with the internal resistance and resistance of the volunteer. The voltage picked up by the volunteer is the voltage across resistor RV.
Total resistance in the circuit = (r + RV) ohms (since both resistors are in parallel)
Current produced by the emf source = E/(Total resistance) = E/(r + RV)
The voltage across resistor RV = current flowing through this resistor × its resistance.
Since all the circuit elements are in series with each other, same current, E/(r + RV) flows through them all
Voltage across RV = voltage measured by the voltmeter = [E/(r + RV)] × RV = (E × RV)/(r + RV) = (E.RV)/(r + RV)
Answer:
(A)8,421.1 V/m
(B)
(C)
(D)
Explanation:
area (A) = 7.6 cm^{2} = 0.00076 m^{2}
distance (d) = 1.9 mm = 0.0019 m
potential difference (v) = 16 V
(A) electric field (E) = Δv / d = 16 / 0.0019 = 8,421.1 V/m
(B) capacitance = (∈₀A)/d
where ∈₀ = permitivity of free space =
capacitance = 
capacitance (C) =
(C) charge (q) = C x v =
=
(D) surface charge density = charge (q) / area =
/ 0.00076 =
KE = 60,000 J
Explanation:
KE = (1/2)mv^2
= (1/2)(30000 kg)(2 m/s)^2
= 60,000 J