Amp hours = watt hours / voltage (Ah = Wh ÷ V). Watt hours = amp hours × voltage (Wh = Ah × V). 1 kilowatt hour equals 1000 watt hours. 1 amp hour equals 1000 milliamp hours
Japan uses two main plug types: Type A with two parallel pins and Type B with two parallel pins plus grounding pin. Type A socket is compatible only with Type A plugs. Type B socket is compatible with both Type B and Type A plugs
Watt-hour (Wh) represents total energy generated/consumed by 1W system over 1 hour. Amp hours indicate charge flow through battery per hour. Voltage describes electricity flow pressure in circuit
Electrical energy is the ability to produce work through various forms. Energy cannot be created or destroyed, only converted. Electrical machines convert energy between different forms. Work done by moving electrons creates electrical energy
Electric potential energy is the energy of a charge moving through a potential difference. Potential difference (voltage) is the change in potential energy divided by charge. Voltage is measured in volts (V), named after Alessandro Volta. Electric potential is independent of test charge
Current (I) equals power (P) divided by voltage (V). At 120V, 1W generates 0.008333A, 100W generates 0.8333A. At 240V, 1W generates 0.004167A, 100W generates 0.4167A