Member level 3
Hi, I've purchased a USB Power Adaptor (240-110V AC input, 5V/1A output), similar to the one used for Apple products. The adaptor even though rated for 1A, provides a maximum of 100mA near 5V (greater than 4.5V). When I connect a 10E/2.5W resistor across the terminals, the current meter shows 450mA (fine!), but the voltage reading says 3.5V. This doesn't make any sense to me according to Ohm's Law. Can somebody explain this please ..?