Dan converts regular pianos into player pianos for a living. He wants to know how he can make sure he isn't drawing too much amperage or wattage and damage the power device. How can he prevent that? Leo says that in general, a power brick won't work if it doesn't match the wattage. Leo says that watts are volts times amps. So watts are where he'll want to be careful. So take the volts and multiple by amps, and see what voltage it can take. Both should be on the power supply or adapter.
Larry needs to get a new charger for the iPad. Leo says that the iPad requires 10w of charging and most chargers are only 5w. So he'll need to pay close attention to the amperage. He could use the same 10w charger for both his iPad and phone, because the phone will only take as much juice as it needs. If it takes forever to charge, it means the charger just isn't powerful enough. He can boost the charging time by putting the iPad into Airplane mode.