Electricity

• Electric current is a flow of electric charge
• Electric current= charge/time
• The formula for electric current is I=Q/t
• An ammeter is connected in series
• A voltmeter is connected in parallel
• Unit for charge is Culombs
• A conventional current goes from positive to negative
• In a series circuit current remains the same
• Voltage=energy transfer/charge
• There are two types of voltage: E.M.F and P.D
• • Resistance is opposition to the flow of charge. Units Ohms
• Resistance= voltage/ current
• Power is energy transfer per unit time
• P= IV
• S.I unit for power is watt
• P= E/t
• E= Pt
• E= (IV)t
• A Sankey diagram shows energy transformations and the amount of energy being used
• Cost of electricity= Power in kw*Time in hours*Cost of 1 unit
• • Electrical conductor is a material that allows current to flow through easily, and has a low resistance
• Electrical insulator is a material that does not allow current to flow easily, and has a high resistance