Which describes the function of a diode when connected to an AC source:

The diode allows current flows in both directions, effectively doubling the AC voltage.

The diode blocks current flow in one direction, converting the $AC$ to a pulsating $DC.$

The diode blocks all current current flow, blocking the AC source from a load.

The diode amplifies the AC source to produce higher voltage DC$.$

QUESTION $7$

Which of the following temperatures transducer would you choose for thermostats around the home? $($I$.$e$.,$ relatively good sensitivity and not expensive$)$

Resistance temperature detector $($RTD$)$

Thermocouple

Thermistor

Pressure gauge