A. State Ohm’s law
B.Describe the process of electrolysis
C. What is the relationship between resistance and resistivity
D. What is the current through 8Ω device operating with 120V
The potential difference required to pass 3A through 42Ω.
E. Describe what is meant by thermocouple?
A. Ohm's law states that the current flowing through a conductor is directly proportional to the voltage applied across it, while the resistance remains constant. Mathematically, it can be expressed as I = V/R, where I represents the current in amperes, V represents the voltage in volts, and R represents the resistance in ohms.
B. Electrolysis is a process in which an electric current is passed through an electrolyte solution to bring about a chemical reaction. This process involves the decomposition of a compound into its constituent elements or the deposition of metal ions onto an electrode. This is achieved by connecting a positive electrode (anode) and a negative electrode (cathode) to a power source, usually a battery or a DC power supply, and immersing them in an electrolyte solution.
C. The relationship between resistance and resistivity is described by the formula R = ρ × (L/A), where R represents the resistance in ohms, ρ (rho) represents the resistivity in ohm-meters, L represents the length of the conductor in meters, and A represents the cross-sectional area of the conductor in square meters. In essence, resistivity is an intrinsic property of a material that quantifies how strongly it resists the flow of electric current, while resistance depends on both the resistivity of the material and the geometry of the conductor.
D. To calculate the current through an 8Ω device operating with a voltage of 120V, you can use Ohm's law. The formula to calculate current is I = V/R, where I is the current in amperes, V is the voltage in volts, and R is the resistance in ohms. In this case, the current would be I = 120V / 8Ω = 15A.
E. A thermocouple is a temperature sensor that operates based on the principle of the Seebeck effect. It consists of two dissimilar metal wires (junctions) joined together to form a circuit. When there is a temperature difference between the two junctions, it generates a voltage known as the thermoelectric voltage or electromotive force (EMF). This voltage is proportional to the temperature difference and can be measured to determine the temperature. Thermocouples are commonly used in various applications, such as measuring temperature in industrial processes, oven temperature control, and in thermometers.
A. Ohm's Law states that the current flowing through a conductor is directly proportional to the voltage across the conductor, given a constant resistance. This relationship is expressed as I = V/R, where I is the current in amperes (A), V is the voltage in volts (V), and R is the resistance in ohms (Ω).
B. Electrolysis is a chemical process that uses an electric current to drive non-spontaneous chemical reactions. It involves the decomposition of a compound into its constituent elements using electrodes and an electrolyte solution. When an electric current passes through the electrolyte, positive ions are attracted to the negatively charged cathode, where reduction reactions occur, and negative ions are attracted to the positively charged anode, where oxidation reactions occur.
C. The relationship between resistance and resistivity is given by the formula R = ρ(L/A), where R is the resistance, ρ (rho) is the resistivity of the material, L is the length of the conductor, and A is the cross-sectional area of the conductor. Resistivity is an intrinsic property of a material and represents its ability to resist the flow of electric current.
D. To determine the current through an 8Ω device operating with 120V, you can use Ohm's Law. The formula to calculate current is I = V/R, where I is the current, V is the voltage, and R is the resistance. Plugging in the given values, the current flowing through the device is I = 120V / 8Ω = 15A.
E. A thermocouple is a device that consists of two dissimilar conductors joined at one end to form a junction. It is used to measure temperature by exploiting the principle of the Seebeck effect. When there is a temperature difference between the two junctions, it creates an electromotive force (EMF) or voltage that is proportional to the temperature difference. This allows for the measurement of temperature by measuring the voltage produced by the thermocouple. Thermocouples are commonly used in various industries and applications for temperature sensing and control.