# Physics Test: Current Electricity and Circuits

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current

I, Amperes (A)

Randomly

### Electric currents when connected to a potential difference, it creates a(n) _ field which creates a(n) _ force setting _ in motion

electric, electrical, charges

### What do batteries and generators have to do to charge carriers?

work/supply energy

### What do batteries and generators set up across a circuit?

a potential difference

### Batteries convert what to what?

chemical PE to electrical PE

### Generators convert what to what?

mechanical energy to electrical PE

no

### Since batteries and generators don't give the circuit charges, the just...

force the charges to move in one direction *note, the electrons are already on the wire

### Electrons flow from (positive/negative) to (positive/negative)

negative to positive

### The electrical force _ the electrons to/from the positive terminal and the electrons are _ to/by the negative terminal

attracts, repelled

high, low

### How does the flow of current in batteries work?

The negative terminal loses negative charge and eventually becomes positive. The positive terminal gains negative charge and eventually becomes neutral. Once the charges even out, there is no longer a potential difference between them, and the flow of electrons (current) stops

### The direction that positive charges would flow (if they did flow)

conventional current, positive to negative

### Which way does conventional current flow?

from positive to negative

### The direction that electrons (negative charges) would flow

Actual current, negative to positive

### Which way does actual current flow?

from negative to positive

yes

Resistance

less

R, Ohms (Ω)

resistor

superconductors

### What are the three factors affecting resistance?

length, cross-sectional area, and conductivity

more, less

thickness

more, less

### What is another way to explain conductivity?

the type of material used

low, high

Ohm's law

directly

inversly

power

P=I^2R

E=ΔVIT

P, Watts (W)

Energy

E, Joules (J)

power

a lot

watt

amp

power

120

Capacitance

-12

-6

Capacitor

capacitor

capacitor

### Thing where plates are connected to a potential difference (voltage source) such as a _

parallel-plate capacitor, battery

### How do parallel-plate capacitors work?

charge is removed from one plate and collects on the opposite plate

### When do charge transfers stop in parallel-plate capacitors?

when the potential difference of the plates equals the potential difference of the battery it's connected to

### How is discharging done in a parallel-plate capacitor?

by connected the capacitor to a conductor via a switch (ex. flash of a camera)

conventional

### What condition is necessary for the flow of heat? What analogous condition is necessary for the flow of charge?

temp difference, potential difference

voltage, current

### What conditions are necessary for the sustained flow of water in a pipe? What analogous condition is necessary for the sustained flow of charge in a wire?

pressure difference, potential difference

### What is electric current?

flow of charge/moving of electrons

### What is an ampere?

unit of current (1 C/s)

### What is a volt?

potential difference (1 J/C)

120 v

### Does voltage flow through a circuit, or is voltage established across a circuit?

established across

resists current

### If the voltage impressed across a circuit is constant but the resistance doubles, what change occurs in the current?

cut in half (inverse)

### If the resistance of a circuit remains constant while the voltage across the circuit decreases to half its former value, what change occurs in the current?

cut in half (direct)

### How does wetness affect the resistance of your body?

resistance decreases

### Distinguish between AC and DC. Which is produced by a battery and which is usually produced by a generator?

alternating current in generators or outlets (2 way), direct current in batteries (1 way)

### From where do electrons originate that flow in a typical electric circuit?

on the wires or conductors

### What is power?

the rate of doing work (1 Watt = 1 J/s)

### Drawings that represent electric circuits using standards symbols for circuit elements

schematic diagrams

circuit

### What are 3 things found in a common circuit?

voltage source (battery, generator, etc), conductor (wire), device to receive electrical energy (light bulb)

### In a common circuit electrons flow from _ to _

negative to positive

complete, gaps

### What will happen if there is a break in an electric circuit?

here will be a complete stop in the flow of electrons

a switch

### Electric current that repeatedly reverses in direction, twice each cycle. Usually at 60 cycles per second

Alternating current

### Example(s) of alternating current

generator, outlet

### "Two way street"

alternating current

Direct current

direct current

batteries

### What is the primary use of current?

to transfer electrical energy

AC circuits

### What 2 things can be inserted into lines that provide power to prevent overloading?

fuses and circuit breakers

### What will excessive current do to the fuse, circuit breaker, and circuit?

blow out the fuse, trip the circuit breaker, and provide a break in the circuit

series circuit

current

Vt=ItRt

### How do you find the voltage drop across each device in the series circuit?

V1=ItR1 (V2=ItR2, etc)

### According to _ Law, in a series circuit there is a voltage drop across each device that depends directly on its _

Ohm's, resistance

Vt=V1+V2+V3...

current

voltage

voltage

parallel circuit

voltage

Vt=ItRt

same (Vt=ItRt)

It=I1+I2+I3...

current

voltage

current

yes

yes

parallel

series

Example: