Question

I have 5 components: component 1 uses 15mA at 5V component 2 uses 66mA at 3V component 3 uses 20mA at 5V component 4 uses 40mA at 7V component 5 uses 9mA at 5V What is the power consumption?

Answer 1

Power consumption `P` in a component is given as

`P=VI`
where `V` is voltage across the component and `I` current used by it.

For total power consumption we need to add individual power consumption of all five components.

`P_"total"=15xx5+66xx3+20xx5+40xx7+9xx5`
`P_"total"=75+198+100+280+45`
`P_"total"=698\ mW`