This may be a newbie question but I'm having a difficult time getting my brain around how much current batteries produce.
For example, Someone not skilled in electronics (like myself) might assume that a standard 9 volt battery would produce 9 amps of current. I'm assuming that there is no resistance to hold back the 9 volts so I = V/R would be 9. Is there some built in resistance that I need to account for?
Another example is when you connect 2 wires directly from a 9 volt battery you get a small spark and the battery slowly gets hot. However, when you connect 2 wires from a 7.2V battery pack you get a large spark and a VERY hot battery pack. Logic tells me that 9 V should produce more current than 7.2 V.
Also, why can you get a shock from a car battery but when you touch 2 terminals on a 12V drill battery you can't feel anything?
I'm obviously missing something here. Is current more a function of the size of the battery cell and not so much the voltage?
If someone can indulge me and help me understand some of these simple questions it would be appreciated!
For example, Someone not skilled in electronics (like myself) might assume that a standard 9 volt battery would produce 9 amps of current. I'm assuming that there is no resistance to hold back the 9 volts so I = V/R would be 9. Is there some built in resistance that I need to account for?
Another example is when you connect 2 wires directly from a 9 volt battery you get a small spark and the battery slowly gets hot. However, when you connect 2 wires from a 7.2V battery pack you get a large spark and a VERY hot battery pack. Logic tells me that 9 V should produce more current than 7.2 V.
Also, why can you get a shock from a car battery but when you touch 2 terminals on a 12V drill battery you can't feel anything?
I'm obviously missing something here. Is current more a function of the size of the battery cell and not so much the voltage?
If someone can indulge me and help me understand some of these simple questions it would be appreciated!