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IBEX SCIENCES supplies specialized Nichrome Wire of Unknown Resistance kits from their main science distribution warehouse in Lahore, Pakistan. [1]
This specific type of pre-measured, coiled wire is an essential item for school, college, and university physics laboratories across Pakistan. It is used as a core tool to help students learn how to manually measure and find electrical values. [1]
What is Nichrome Wire of Unknown Resistance?
In standard physics experiments (such as the Matriculation, F.Sc, or A-Level board practicals), students are handed a piece of wire without being told its resistance. Nichrome (a mixture of Nickel and Chromium) is chosen because it has a high and stable electrical resistivity. This means it pushes back against electricity enough to create clear, easily readable measurements on lab meters without overheating too quickly. [1, 2, 3]
Common Lab Experiments Performed With It
Students use this product to conduct several classic physics procedures:
- Determining Unknown Resistance via Ohm’s Law: By connecting the wire to a battery and measuring the current (I) and voltage (V), students use the formula \(R = \frac{V}{I}\) to find the hidden resistance. [1, 2]
- Meter Bridge / Wheatstone Bridge Experiments: The unknown wire is placed into one gap of a bridge circuit. Students slide a key along a meter scale until a galvanometer balances to zero, allowing them to calculate the exact resistance mathematically.
- Finding Specific Resistivity (ρ): After finding the total resistance, students use a micrometer screw gauge to find the wire’s thickness (A) and a ruler for its length (L) to figure out the material’s exact electrical property using \(\rho = \frac{R \cdot A}{L}\). [1, 2]
Product Features
- Uniform Thickness: Sourced in standard laboratory wire sizes like 26 SWG or 30 SWG (Standard Wire Gauge) to ensure even electrical flow. [1]
- Pre-Mounted Options: Available as loose experimental coils or pre-wound onto small plastic blocks with clean brass terminal screw posts for fast connection to alligator clips.
- Low Temperature Coefficient: The wire’s resistance stays steady even as it warms up during active electrical testing. [1]
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