Ohm’s Law The relationship between voltage, current and resistance is known as Ohm’s Law: V = IR Voltage (V) = Current (I) x Resistance (R) Volts.

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Presentation transcript:

Ohm’s Law The relationship between voltage, current and resistance is known as Ohm’s Law: V = IR Voltage (V) = Current (I) x Resistance (R) Volts (V) amps (A) ohms (Ω) The greater the amount of resistance, the lower the current Resistance = Voltage ÷ Current R = V I Current = Voltage ÷ Resistance I= V R

2. Fill in the following table and calculate Resistance. 2.4 Ω 2.65 Ω 2.4 Ω 2.5 Ω 2.4 Ω

Example #1 A current of 2.5 mA flows through a resistor when connected to a 16 V power supply. What is the value of this resistor? R = V I = 16 V 0.0025 A 6400 Ω

Example #2 What is the current produced by a potential difference of 240 volts through a resistance of 0.2 ohms? R = 0.2  V = 240 V I = V I = ? R = 240 V 0.2  = 1200 A