Electric Charge And Electric Current — Practice Quiz
Tamil Nadu Board · Class 9 · Science
Try a 4-question quiz on Electric Charge And Electric Current for Tamil Nadu Board Class 9 Science: tap an answer to check it and see why.
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Quick Quiz: Electric Charge And Electric Current
0/4Tap an answer to check it instantly. No sign-up needed for these 4.
What is the SI unit of electric charge?
When you rub a plastic comb on dry hair, the comb becomes negatively charged. What happens to your hair?
What is the charge on one electron?
Like charges _______ each other and unlike charges _______ each other.
Sample Questions
Electric current is defined as the rate of flow of charge. If 25 C of charge passes through a wire in 5 seconds, what is the current?
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5 A
Step 1: The formula for electric current is I = q / t. Step 2: Here, q = 25 C (charge) and t = 5 s (time). Step 3: So, I = 25 / 5 = 5 A. Step 4: The unit of current is ampere (A), where 1 A = 1 C/s. Step 5: Option 0.2 A would be wrong because that is t/q, not q/t — a common mistake to avoid.
Which instrument is used to measure electric current in a circuit?
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Ammeter
Step 1: An ammeter is the instrument designed specifically to measure electric current. Step 2: It is always connected in series in a circuit so that the same current flows through it. Step 3: A voltmeter measures potential difference (voltage) and is connected in parallel. Step 4: A thermometer measures temperature, not current. Step 5: A galvanometer can detect very small currents but is not the standard instrument for measuring current in normal circuits.
What does EMF (electromotive force) of a battery represent?
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The work done by the source to drive one unit charge around the complete circuit
Step 1: EMF stands for Electromotive Force, represented by the symbol ε. Step 2: It is defined as the work done (W) by the electrical energy source in driving one unit of charge (q) around the complete circuit. Step 3: Formula: ε = W / q. Step 4: The SI unit of EMF is volts (V) or joules per coulomb (J/C). Step 5: A battery is like a water pump — it 'pushes' the charges to flow, and EMF is a measure of that pushing ability.
How is a voltmeter connected in a circuit to measure potential difference across a bulb?
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In parallel with the bulb
Step 1: A voltmeter measures the potential difference (voltage) across a component. Step 2: To measure the voltage across any component, the voltmeter must be connected in parallel — meaning it is connected across the two terminals of the component. Step 3: When connected in parallel, both the voltmeter and the bulb experience the same potential difference. Step 4: An ammeter, on the other hand, is connected in series. Step 5: Remember: Voltmeter → Parallel; Ammeter → Series.
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