2W151A Volume 3 Questions and Answers 100% Pass

2W151A Volume 3 Questions and Answers 100% Pass What is the formula to calculate electrical power? The formula to calculate electrical power is P = V × I, where P is power, V is voltage, and I is current. What is the unit of electrical resistance? The unit of electrical resistance is the ohm (Ω). What is the relationship between voltage, current, and resistance in Ohm’s Law? Ohm's Law states that V = I × R, where V is voltage, I is current, and R is resistance. What happens to the current if the voltage is increased, but resistance stays the same? If the voltage is increased while resistance stays the same, the current will increase according to Ohm’s Law. What is the unit of electric current? The unit of electric current is the ampere (A). 2 What does a voltmeter measure? A voltmeter measures the potential difference (voltage) between two points in an electrical circuit. What is the effect of increasing resistance on current, assuming voltage remains constant? If resistance increases while voltage remains constant, the current will decrease according to Ohm’s Law. What does an ammeter measure? An ammeter measures the current flowing through a circuit. What is the relationship between power, voltage, and resistance in a circuit? The relationship is P = V2 / R, where P is power, V is voltage, and R is resistance. What is the unit of electric power? The unit of electric power is the watt (W). 3 What is the effect of increasing voltage on current, assuming resistance stays the same? If voltage increases while resistance stays the same, the current will increase according to Ohm’s Law. How does the resistance of a conductor change with temperature? The resistance of a conductor generally increases with an increase in temperature. What is the formula to calculate the total resistance in a series circuit? In a series circuit, the total resistance is the sum of all individual resistances: R_total = R1 + R2 + R3 + .... What is the formula to calculate the total resistance in a parallel circuit? In a parallel circuit, the total resistance is found using the formula 1/R_total = 1/R1 + 1/R2 + 1/R3 + .... What is the power dissipated by a resistor in a circuit? The power dissipated by a resistor is calculated using the formula P = I2 × R, where P is power, I is current, and R is resistance. 4 What does a capacitor store in a circuit? A capacitor stores electrical energy in the form of an electric field. What is the purpose of a fuse in an electrical circuit? A fuse is designed to protect an electrical circuit by breaking the circuit if the current flow exceeds a certain limit. What is the formula for calculating the energy used by an electrical appliance? The formula for calculating energy is E = P × t, where E is energy, P is power, and t is time. What is the relationship between the current and the number of electrons flowing in a circuit? Current is the flow of electric charge, and it depends on the rate at which electrons flow through the circuit. What happens to the current in a circuit if the resistance is halved while the voltage remains constant? If the resistance is halved while voltage remains constant, the current will double according to Ohm's Law. 5 What is the effect of increasing the number of resistors in a parallel circuit? Increasing the number of resistors in a parallel circuit decreases the total resistance. What is the purpose of a resistor in an electrical circuit? A resistor is used to limit the current flow and control the voltage within a circuit. What is the difference between alternating