Careful with that formula! It must be applied consistently to one component. The 100 Volts appears across the combination of the wire and the apparatus. (You can treat the combination as one component "in a black box" and use 100 = R*2.5 to find the combined resistance of the wire and the apparatus. But that doesn't do you much good.)V=IR
100=R x 2.5
Voltage drop is the decrease in electrical potential that occurs when current flows through a circuit. It is caused by the resistance of the materials used in the circuit, and can lead to a decrease in the amount of voltage available to power devices.
Voltage drop is important to calculate because it can affect the performance and efficiency of a circuit. If the voltage drop is too high, it can lead to devices not receiving enough power, which can cause malfunctions or failures. Additionally, excessive voltage drop can lead to overheating and potential safety hazards.
Voltage drop is calculated using Ohm's Law, which states that voltage drop (V) is equal to the current (I) multiplied by the resistance (R) of the circuit. The formula for calculating voltage drop is V = I x R.
The main factors that affect voltage drop are the length and cross-sectional area of the wire used in the circuit, as well as the material and temperature of the wire. Other factors that may affect voltage drop include the type and number of devices connected in the circuit, and the overall design and layout of the circuit.
The wire size used in a circuit affects the amount of resistance and therefore the amount of voltage drop. Using the correct wire size ensures that the voltage drop is within an acceptable range and that devices in the circuit receive enough power. It also helps prevent overheating and potential safety hazards.