# Current and Reverse Bias

• TyErd
In summary, current bias and reverse bias refer to the direction of voltage applied to a circuit. In current bias, the positive voltage allows current to flow, while in reverse bias, the negative voltage prevents current from flowing. In a current bias, electrons are attracted towards the positive terminal, creating a current, while in reverse bias, electrons are repelled from the negative terminal, preventing current flow. Reverse bias is commonly used in electronic devices to control or protect current flow, and the magnitude of reverse bias affects the width of the depletion region in a semiconductor, reducing current flow.

## Homework Statement

Indicate which of the 6 LEDs are ON and which are OFF

V=IR

## The Attempt at a Solution

Okay, I know LEDs 4,5 and 6 will be ON and LED 2 and 3 will be OFF but what about LED 1? Because LED 2 has a very high resistance as it is reverse biased thus no current flows, but would that mean current would still flow through LED 1?

#### Attachments

• circuit6.JPG
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LED-s 1, 2, 3 are connected in series. Can the current flowing through LED 1 be different from the current which flows through the other ones?

ehild

oh i See! thankyou I understand now.

## 1. What is the difference between current bias and reverse bias?

In a current bias, the voltage applied to a circuit is positive, allowing current to flow through the circuit. In a reverse bias, the voltage is negative, preventing current from flowing through the circuit.

## 2. How does current flow in a current bias?

In a current bias, the positive voltage applied to the circuit attracts electrons towards the positive terminal, allowing them to flow through the circuit and creating a current.

## 3. Why does current not flow in a reverse bias?

In a reverse bias, the negative voltage applied to the circuit repels electrons from the negative terminal, preventing them from flowing through the circuit and creating a current.

## 4. What is the purpose of using reverse bias in electronic devices?

Reverse bias is commonly used to control the flow of current in electronic devices. It can be used to turn a device off or to protect it from excessive current flow.

## 5. How does the magnitude of reverse bias affect the behavior of a semiconductor?

The magnitude of reverse bias affects the width of the depletion region in a semiconductor, which is the region where no current can flow. As the reverse bias voltage increases, the depletion region becomes wider, reducing the flow of current through the semiconductor.