I'm not sure if this is a bit of a silly question but,
Can I plug nodemcu esp8266 into wall using its usb port and a phone adapter and if i can do that how much energy will it consume
Yes, you can power a NodeMCU with a 5volt USB cellphone charger.
The NodeMCU draws about 100mA, so consumes about 5volt * 0.1Amp = 0.5watt.
Less than 1watt total if you also count the power loss in the supply.
Leo..
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The energy consumption also depends on what the code is doing...
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It only drops when using sleepmodes.
Otherwise it stays rather constant.
Leo..
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I think the 2.4GHz radio uses power, it may not always be on.
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The radio uses quite a bit of power when transmitting.
The NodeMCU boards have on board voltage regulator and power supply capacitors that mostly average this out, but it's a concern if one is using an ESP-01 or similar board without on board regulation.
Link shows current profile of an ESP-01: https://www.researchgate.net/publication/305649843_Power_analysis_of_local_transmission_technologies
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