Laptop power supplies can vary in voltage and current rating, along with barrel jack diameter. Some don't even use standard barrel jacks. Dell and HP have stuck with a 7mm dc jack for laptops with dell choosing 19.5v and hp 18.5v. Some older IBM laptop power supplies have a 5mm jack and run at 16v. Newer lenovo power supplies run at 20v.
Make sure to use the appropriate power supply for your laptop with the correct operating voltage and current rating. Most laptop supplies are rated at 45watts, 65w or 90w. P=IV. P=power, I=current, V=voltage. so for a 90w power supply for your dell laptop: 90=19.5*x, x=4.62amps.
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