high-resistance voltmeter
What high-resistance voltmeter means in Chemistry A-Level, as defined for AQA, OCR.
Definitions of high-resistance voltmeter
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Reference: OCR
A high-resistance voltmeter connects the two electrodes and reads the e.m.f. under near-zero current so the cell is close to equilibrium.
Used so that almost no current flows and neither equilibrium is disturbed.
A meter that draws almost no current, so the reading is the EMF.
Topics that use high-resistance voltmeter
- Electrode potentials and cells (A-level only) (AQA A-Level)
- Redox and electrode potentials (OCR A-Level)
Related terms
- feasibility prediction
- standard conditions
- standard hydrogen electrode
- Applying familiar redox method to unfamiliar systems
- cell diagrams
- charge balance
- combining half-equations
- Concentration effects
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