My BlackBerry charger reads: Input: 100-240V ~ 150mA 50-60Hz 10-20VA Output: 5V-700mA Can I use it with my RasPi? Also, what does 10-20VA mean? I'm sorry to ask all this, but I'm a total beginner in this matters... Focus on the Input and Output... Also VA sounds like it might have been VAC (AC Volt...