Electric Current and Circuits (5.3) Flashcards
What are the conditions needed for current to flow
Current will only flow in a circuit when the circuit forms a continuous (closed) loop from one terminal of the power supply to the other
What direction does conventional current flow?
Conventional current flows opposite to the direction of electron flow
Which direction does Current flow (I)
Positive to negative
Which direction do electrons flow?
Negative to postive
How is current calculated? (explain equation)
Current is calculated by the equation I = q/t. Charge of a circuit is found by the number of electrons flowing through a circuit multiplied by the charge of one electron. This total charge is divided by time (t) in seconds to give the current in amperes (A)
What is electron flow
Electron flow refers to the flow of electrons from the negative to positive terminal of a power supply
What is power
Power is a measure of how fast energy is converted by an appliance
Volts is the potential difference (N.A)
Current is the flow of electrons (N.A)
Work is in joules (N.A)
Explain the flow of energy within a circuit in terms of power supply and electron flow (3 marks)
Power supply transfers energy to the electric field by forcing electrons to the positive terminal of the power supply
The electrical energy in the electric field is transferred to components in the circuit by the electrons and converted to other forms
