Current and Voltage Flashcards
How is energy transferred?
Energy is transferred from the power source to the electric charge moving through the circuit
What does the charge do when energy is being transferred?
The charge then transfers this energy to the load in the circuit
What forms of energy is the lost energy transferred to once lost by the charge?
Light, thermal etc
What is a current?
Is the rate at which charge flows through a circuit note- a current cannot flow if the circuit is open or broken
What is current measured in?
Current is measured in amperes (which is often abbreviated to amps or A)
What is 1 ampere equal to?
1 ampere = 1 coulomb of charge passing through a cross section of wire each second
What is the worth of one coulomb?
1 coulomb is 6.24 x 10 to the power of 18 electrons
The current flowing through a component in a circuit is measured with what?
The current flowing through a component in a circuit is measured using an ammeter.
An ammeter must be connected in series with the component
What is the characteristic of a current if it is in a series circuit
It is the same everywhere
What happens as more components are added?
As more components are added the current decreases due to added resistance
What is voltage?
Voltage is a measure of the difference inelectrical energybetween two parts of a circuit.
*also known as potential difference
What relationship exists between the difference in energy (potential energy) and voltage in an electrical circuit?
The bigger the difference in energy, the bigger the voltage
What is voltage measured in?
Voltage is measured involts, the symbol for volts isV
What is voltage measured with?
Voltage is measured using a voltmeter
How do you measure the voltage across a component in a circuit?
To measure the voltage across a component in a circuit, you must connect the voltmeter inparallelwith it
