Question

Name the units used to measure: (a) conductance, (b) quantity of electricity, (c) electrical energy, (d) potential difference?

Answer 1

There are following units to measure, (a) conductance : It is measure in Siemens per meter (S/m). (b) quantity of electricity : It is measure in ampere (A). ... (d) potential difference : It is measure in volt.

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Answer 2

The units for measuring

(a) conductance is mho or Siemens (S)

(b) quantity of electricity is Coulomb(C)

(c) electrical energy is Joules(J)

(d) potential difference is Volts (V)

What is conductance?

• Conductance is the degree to which a body can conduct electricity.
• It is denoted as G. It is the reciprocal of Resistance.
• Thus,

                                     G = $\frac{1}{R}$

Since R is in ohms (Ω), G has units (ohm)⁻¹ or mho or Siemens(S).

How is electricity measured?

• Electricity is measured as the number of electrons conducted by an object in a given time.
• Thus Quantity of Electricity = Current × Time
• The unit of electricity is Coulomb.
• "1 Coulomb is the amount of electricity produced when 1 Ampere current flows through a conductor in 1 second."

What is Electrical Energy?

• Electrical energy is the work done to move a charge in an electric potential field.
• Its unit is Joules(J).
• "1 J can be defined as the work done to move a charge of 1 C through a potential difference of 1 V."

                                    W = QΔV

                                 ⇒   W = C × V

                                 ⇒   J = CV

What is Potential Difference?

• Electric Potential is the amount of work done to move a test charge from a reference point to another specific point in an electric field.
• Since the exact potential for a point cannot be calculated, we assume a reference point such that its potential is 0.
• From this reference point, the potential of all other points is calculated. Hence, the need to define potential difference arises.
• The potential difference has the unit Volt.
• "1 Volt is defined as the potential difference between two points of a conducting wire which dissipates 1 Joule of energy when 1 C of charge is moved through it."
• Also,

                                         V = IR                      (Ohm's Law)

where 'I' is current

   and 'R' is resistance

                                        ⇒ V = A × Ω

Hence, the units of measurement are:

(a) conductance is mho or Siemens (S)

(b) quantity of electricity is Coulomb(C)

(c) electrical energy is Joules(J)

(d) potential difference is Volts (V)