- Under-Current
- (n.) Current intensity lower than the nominal intensity of an electrical receiver, which does not allow its normal operation. A lamp with under-current glows weakly.
- Under-Voltage
- (n.) Voltage lower than the nominal voltage of an electrical receiver, which does not allow its normal operation. A lamp with under-voltage glows weakly.
- Usage Intensity
- (noun) The current intensity required for a device to function normally.
- Vapor
- (n.f.) Gaseous state of a substance.
- Vaporization
- (n.f.) Transition from the liquid state to the gaseous state.
- Variable Voltage
- (n.) Voltage whose value changes over time.
- Velocity
- (n.f.) Ratio of the distance traveled (d) to the time taken (t) to travel that distance: v = d / t, where v (velocity) is in m/s, d (distance) is in m, and t (time taken) is in s.
- Volt
- (n.m.) Legal unit of electrical potential difference (Symbol: V).
- Voltmeter
- (n.m.) Device used to measure electrical potential difference. It is connected in parallel with the component being studied.
- Volume
- (n.m.) (from the Latin volumen, meaning scroll) Physical quantity that corresponds to the space occupied by an object. Its legal unit is the cubic meter (m3), but the liter is also commonly used (1 L = 0.001 m3).