Electric Current and Its Effects
Joules law is
  • H = I²Rt
  • H = IRt
  • H = IRt²
Explanation: Joule's Law states that the heat (H) produced by a current passing through a conductor is directly proportional to the square of the current (I), the resistance (R), and the time (t) for which the current flows. The formula is H = I²Rt, where: H is the heat energy in joules, I is the current in amperes, R is the resistance in ohms, t is the time in seconds.
1 H.P. equals
  • 647 watts
  • 746 watts
  • 1000 watts
  • 500 watts
Explanation: 1 Horsepower (H.P.) is equal to 746 watts. This is a standard unit used to measure power, especially in engines and motors.
Electrolytes are usually in the form of
  • Plasma
  • Gases
  • Solids
  • Liquids
Explanation: Electrolytes are usually in the form of liquids because they consist of a solvent (usually water) that dissolves salts, acids, or bases, allowing them to dissociate into ions that can conduct electricity.
1 Watt hour is equal to
  • 3.6x10^3 J
  • 3.6x10^4 J
  • 3.6x10^8 J
  • 3.6x10^5 J
Explanation: 1 Watt-hour (Wh) is equal to 3.6 × 10³ joules (J). This is because 1 watt = 1 joule per second and there are 3600 seconds in one hour, so: 1Wh = 1W × 3600s = 3600J = 3.6×10^3 J.
The primary cell widely used is
  • Lechlanche cell
  • Lead acid accumulator
  • Dry cell
  • Daniel cell
Explanation: The dry cell is the most widely used primary cell, commonly found in household items like flashlights, remote controls, and portable devices. It is called a "dry cell" because it uses a paste electrolyte rather than a liquid, making it more convenient for portable applications.
The reciprocal of resistance is
  • Conductance
  • Specific resistance
  • Resistivity
  • Conductivity
Explanation: The reciprocal of resistance is called conductance. It measures how easily electric current can flow through a material and is represented by the symbol G. Conductance is the inverse of resistance, and its unit is siemens (S).
In the electrolyte of the cell, current flows from ____
  • Positive to positive terminal
  • Negative to negative terminal
    • Explanation: In the electrolyte of the cell, current flows from the negative terminal to the positive terminal. This is because the electrons flow from the negative terminal, but in the electrolyte, it is the positive ions that move toward the negative terminal and negative ions toward the positive terminal.