5V 10A vs 10V 5A: Which Is More Dangerous or Severe in Electrical Circuits?

Hello,
Just out of curosity, Which is more imporant voltage or current. to be more elaborate 5 volts and 10 ampere vs 10 volt and 5 ampere. Which one of the both is more severe. 
Thanks,Bejoy

Bejoy,
The short answer is "it depends". Both of the cases you mention will give 50W.
In most cases, you will want to use a higher voltage  and lower current since a higher current will require heavier wire (or larger PCB traces) to withstand the current. The higher the wattage you need to use, the more this is true. It is also more important the longer the distance that the current has to travel.

On the other hand, you do not want to increase the voltage to the point where your parts will be damaged. For instance, you do not want to use 10 V on a circuit if the maximum voltage allowed by the parts is 5 V.

Safety is also a concern for voltages at 50 V or higher which require additional precautions.

Eliza, I totally agree with you..  

Basically the relationship between voltage, current, and resistance is described by Ohm's law. I am sharing my 10th standard this is the only thing I usually know other things have been washed out from mind so see this equation, i = v/r, tells us that the current, I, flowing through a circuit is directly proportional to the voltage, v, and inversely proportional to the resistance, r. Solve with the given formula you will get to your answer.

100 mA of current can kill a man.If you must drive a motor, you need current.
If you must generate a voltaic arc (spark) you need voltage.Giovanni

Moreover, to recharge a battery of 5V and 10A, you need a voltage of 5V and 1A (=5 Watt) and NOT a voltage of 0.5V and 10A (=5 Watt).Every device needs the correct voltage and the correct current.Giovanni