Current On your show me boards draw circuit symbols for. 1 LDR

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Presentation transcript:

Current On your show me boards draw circuit symbols for. 1 LDR 2 Thermistor 3 Diode 4 Variable resistor

Voltage Voltage is the amount of energy transferred (changed) per coulomb of charge. 1 Volt = 1 Joule per coulomb A voltmeter connected across the component

V = E/Q V=Voltage E=Energy Q = Charge E V Q X

☺ ☺ ☺ ☺ ☺ ☺ ☺ ☺ ☺ ☺ ☺ Current I = Q/t I’m counting how many coulombs of electrons go past me every second ☺ ☺ ☺ The number of Coulombs flowing past a point in the circuit every second. I = Q/t ☺ ☺ A ☺ ☺ ☺ ☺ ☺ ☺ Can you copy this please? 1 Amp = 1 coulomb per second

Q = It Q=Charge I=Current t = time Q t I X

Ohm’s Law V = IR V=Voltage I=Current R = Resistance V R I X

Can you copy this please? Resistance Measures how difficult it is for current to flow. Measured in Ohms (Ω) ☺ A V Can you copy this please? Resistance = voltage/current R = V/I

Page 118-119

Answers Q1. chare, voltage, work, reduces, decrease. Q2 Current A amps, Resistance Ω ohms, Potential Difference V volts. Q3 Q=It = 5*20*60=6000C B)

Milliamps! 1 A = 1000 mA 1 mA = ?

Milliamps! 1 A = 1000 mA 1 mA = 0.001 A

In a series circuit Current is the same at any point in the circuit

Can you copy this please? In a series circuit Current is the same at any point in the circuit 2.5 A 2.5 A ☺ 2.5 A 2.5 A Can you copy this please?

In a parallel circuit The current splits (total current stays the same) 2.5 A 2.5 A 1.25 A 1.25 A

Can you copy this please? In a parallel circuit The current splits (total current stays the same) 2.5 A 2.5 A 1.25 A ☺ 1.25 A Can you copy this please?

Can you copy this please? Resistance Measures how difficult it is for current to flow. Measured in Ohms (Ω) ☺ A V Can you copy this please? Resistance = voltage/current R = V/I

In a series circuit The sum of the voltages across the lamps equals the voltage across the cells 9 V 3 V 3 V 3 V

Can you copy this please? In a series circuit The sum of the voltages across the lamps equals the voltage across the cells 9 V ☺ 3 V 3 V 3 V Can you copy this please?

In a parallel circuit In a simple parallel circuit, voltage across each lamp equals the voltage across the cells 5 V 5 V 5 V

Can you copy this please? In a parallel circuit In a simple parallel circuit, voltage across each lamp equals the voltage across the cells 5 V 5 V ☺ 5 V Can you copy this please?

Resistance Measures how difficult it is for current to flow. Measured in Ohms (Ω) A V Resistance = voltage/current R = V/I