dynamic electricity: circuits Flashcards
what’s electricity
electrical charges in motion
what’s electric current
flow of negative charge carried by electrons
what’s an electric circuit
a network in which electrical charges can flow continuously in a loop
what’s current intensity
the number of charges that flow past a given point in an electrical circuit every second
what’s the unit for current intensity
I: ampere (A)
what’s an ammeter
measures the current (I in amps) flowing in through the circuit
where is the ammeter always connected
in the circuit
what’s the symbol for ammeter
A
what’s the potential difference
- the amount of energy transferred between points in a vertical circuit (volts)
- the push needed to make the current flow
what’s a voltmeter
measures the potential difference between 2 points, how much that “push” has changed
what is the voltmeter always connected to
outside the circuit
what’s happens to the flow when the switch is closed
current flows
what’s happens to the current when the switch is open
current does not flow
what’s the electrical resistance
the ability of a material to slow down or resist the flow or electric current
what’s the unit for the resistor
ohms
what are the 2 types of resistors
- component that acts to reduce current flow to lower voltage in circuits
- complement that transforms electrical energy into heat, light, sound or motion (light bulbs, motors, speakers)
how is the size of restriction found
dividing the pressure applied to circuit by the flow rate (voltage/amperage)
what’s the ohms law
states that for a given resistance, the potential difference in a circuit is directly proportional to the current intensity
what’s the formula to find the voltage
V= R•I
what’s a series circuit
circuit with only 1 loop
what’s a parallel circuit
circuit with 2 or more loops
what’s the formula for power
Pe= VI
what’s the formula for electrical energy
E=Pe🔺T
what can volts be referred to as
potential difference
what can amps be referred to as
current intensity
