First, calculate the resistance of the heater using Ohm's Law: R = V / I = 60V / 4A = 15 ohms. Assuming the resistance remains constant, when the voltage increases to 150V, the new current is I = V / R = 150V / 15 ohms = 10A.
14562
Which factor primarily determines the electrical resistivity of a conductor?
Resistivity is an intrinsic property of a material that measures how strongly it opposes the flow of electric current. While resistance depends on length and cross-sectional area, resistivity depends solely on the material's composition and temperature.
14563
What is the primary purpose of intentionally adding a resistor in series within an electrical circuit?
Adding a resistor in series increases the total equivalent resistance of the circuit. According to Ohm's Law (I = V/R), if the supply voltage remains constant, an increase in total resistance results in a decrease in the overall current flowing through the circuit. This is a standard method for limiting current to protect components or adjust circuit behavior.
14564
If both the electric current and the potential difference across a resistor are doubled while the resistance remains constant, what is the resulting change in power?
Power is defined by the formula P = IV. If both current (I) and voltage (V) are doubled, the new power becomes P' = (2I)(2V) = 4IV. Therefore, the power increases by a factor of four, or quadruples. This relationship is consistent with Ohm's Law, where P = I^2R; doubling the current while keeping resistance constant results in a fourfold increase in power dissipation.
14565
Calculate the current drawn by an electric heater coil from a 220 V source if the resistance of the coil is 100 ohms.
According to Ohm's Law, current (I) is equal to voltage (V) divided by resistance (R). Using the formula I = V/R, we have I = 220 V / 100 ohms = 2.2 amperes. The unit for current is the ampere (A), not the coulomb (C).
14566
If 4 resistances of $$\frac{1}{4}\Omega $$ are connected in series order then how much the maximum resistance may be obtained?
Source answer preserved: option C (1 Ω). AI attempted to change protected answer data (option_b, option_d), so this item is flagged for manual review before study use.
14567
Which physical quantity, measured across the ends of a resistor, is directly proportional to the current flowing through it, assuming constant temperature?
According to Ohm's Law, the potential difference (voltage) across a conductor is directly proportional to the current flowing through it, provided that physical conditions such as temperature remain constant. The constant of proportionality in this relationship is defined as the electrical resistance of the conductor.
14568
What is the primary function of a current controller (rheostat) when integrated into an electric circuit?
A rheostat is a variable resistor. By adjusting its internal resistance, it allows the user to regulate the flow of current in a circuit. While it controls current, it does so by physically changing the circuit's resistance.
14569
Which of the following factors does not influence the electrical resistance of a conductor?
The resistance of a conductor depends on its length, cross-sectional area, and the material (matter) it is made of, which determines its resistivity. External pressure does not directly affect the resistance of a standard metallic conductor.
14570
What is the name of the physical law stating that the current flowing through a conductor is directly proportional to the potential difference across its ends?
Ohm's Law defines the relationship between voltage (V), current (I), and resistance (R) in an electrical circuit. It states that for a metallic conductor at a constant temperature, the current is directly proportional to the applied potential difference.
