2 - 7 Current and voltage in circuits
● ***Current: rate of flow of charge
● ***Electric current in solid metallic conductors is flow of (negatively charged)
electrons (i.e.: from negative pole to positive pole)
●
Current (measured in Amperes [A])
● ***Q( charge[C ])=I (current [ A ])∗t (time[ s ])
● Ammeter connected in series in circuit
● ***Current is not “used up” in any point of circuit
Voltage (measured in Volts [V])
● ***Voltage: measures amount of energy given to charges by cell/battery
● E.g.: when current passes through light bulb, energy transferred to surroundings as
heat + light
● *** E( energy transferred [J ])=Q(charge[C])∗V (voltage [V ])
● Voltmeter connected in parallel (to measured component) in circuit
1
● ***Current: rate of flow of charge
● ***Electric current in solid metallic conductors is flow of (negatively charged)
electrons (i.e.: from negative pole to positive pole)
●
Current (measured in Amperes [A])
● ***Q( charge[C ])=I (current [ A ])∗t (time[ s ])
● Ammeter connected in series in circuit
● ***Current is not “used up” in any point of circuit
Voltage (measured in Volts [V])
● ***Voltage: measures amount of energy given to charges by cell/battery
● E.g.: when current passes through light bulb, energy transferred to surroundings as
heat + light
● *** E( energy transferred [J ])=Q(charge[C])∗V (voltage [V ])
● Voltmeter connected in parallel (to measured component) in circuit
1
