Physics fill in the blanks.

With increase in temperature, the resistivity of manganin __________ [decreases/ remains unchanged/increases].

Current is the rate of flow of ________ [Charge/resistance/ potential difference] per unit time.

Unit of electrical energy consumed if power is expressed in watt is ________ [watt hour/jule second/watt].

The effective resistance in ________ [series/parallel/combination] is sum of individual resistances.