RC circuits

charge, capacitor, powers

When you use a flash camera, it takes a few seconds to ______ the _________, that ______ the flash.

RC circuit

A circuit that contains both resistance and capacitance.

C = q/V

Capacitance formula

Vc = q/C

Voltage across the capacitor

ε - Vr - Vc = 0

Equation given by the Kirchhoff’s loop rule to understand the charging of the capacitor.

Q = Cε

Max. Charge formula

I0 = ε/R

Initial current through the resistor formula

I(t) = I0*e^-t/τ

Current through the charging RC circuit.

V(t) = ε(1 - e^-t/τ)

Voltage difference across the capacitor when it’s increasing

V(t) = (I0*T)e^-t/τ = εe^-t/τ

Voltage difference across the resistor

-Vr - Vc = 0

Equation given by the Kirchhoff’s loop rule to understand the discharging of the capacitor.

resistance, Internal resistance, resistance, internal resistance, slower

The __________ while charging is significantly greater than while discharging.

___________________ of the battery accounts for most of the __________ while charging.

As the battery ages, the increasing ___________________ makes the charging process even ______.

Relaxation oscillator

A device consisting of a voltage source, resistor, capacitor, and neon lamp.

Used for controlling the indicator lights to flash at certain frequencies, also used for controlling the windshield wipers.

short-circuit, capacitor, discharges

Neon lamp acts as a _____________, when reaches a specific voltage, and the __________ __________ through the neon lamp and produces light. Before that it is charging the capacitor.

.

Neon in the lamp breaks down, and allows the capacitor to discharge through the lamp, producing a bright flash.

Tunnel diode

A device just like relaxation oscillator but the neon lamp is now replaced with the transistor.

It’s like a voltage controlled switched. Normally open but when the right voltage is applied it closes and conducts

The switch can be used to turn on the another circuit (turn on light or run a small motor)

Heart rate

Normally controlled by the electrical signals, which causes the muscles of the heart to contract and pump the blood.

Pacemaker

A device that have sensors that detects the body motion and breathing to increase the heart rate during physical activities, thus meeting the increased need for blood and oxygen.

In this device an RC timing circuit is used to control the time between voltage signals to the heart.

RC filters

Device used in the AC circuits to filter out the unwanted frequencies from the signal

555 timer

A device that provides timed voltage pulses. The time between these pulses is controlled by an RC circuit.

Rheostat

A variable resistor with a knob of slider, that gets used to control the current by adjusting the resistance in a circuit. (Is sometimes the part of an RC circuit)

output of the capacitor, voltage-controlled switch, discharging, capacitor, capacitor

Inside the windshield wipers, the ___________________ is used to control a ______________________; that normal is open but when the output reaches a certain.value it closes, energizing an electric motor, and __________ the _________. The motor causes the windshield wipers to sweep once across the windshield and the ___________ begins to charge again.